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The Jeep: Suspension

(Last Update: 3 March 2003)

Current Statistics:

  • Front suspension and disk brakes from a 1979 Ford full-sized Bronco.
  • Front coil springs from a 2wd 1976 Ford F-100.
  • Superlift springs in rear, in SOA configuration.
  • Custom 5/8" U-bolts.
  • Moroso axle/spring pads.
  • Spring U-bolt plates from a 1/2 ton Dodge truck and a Ram Charger.
  • Track bar from a 1966 Ford Bronco.
  • Front shock towers from a 1986+ F-250/F-350.
  • Custom rear spring plates made from 1/4" steel plate.
  • Custom drilled spring pads on the rear axle.


    The Future Holds:

  • 33" or 35" mud tires.
  • Front springs (probably early Bronco lift springs).
  • Rear shock mounts (on the frame).
  • Panhard rod setup on the front axle (this or other lateral control is required for a coil spring suspension).
  • (Some specifics to be determined later, based upon good deals and what I can build myself.)


    The Suspension Details:

    Initially, I got a great deal on a complete Superlift 2" setup. I actually bought it before I had axles. (I was going to go mild on the suspension. That idea sure didn't last long.) The kit included all four CJ springs, yellow polyurethane spring bushings and shock bushings, U-bolts, shocks, and shock boots of my choice of colors. It wasn't long before I was thinking of going spring-over, even with the lift springs. Then, after purchasing the front axle and the first rear axle, I started a session with the tape measure. (To see what happened with the first rear axle, please go here: The Jeep's Axles.)

    Oops.

    The front axle I bought wouldn't fit correctly with front leaf springs. The driver's side spring would end up entirely on the cast differential housing, since I'm using full-sized truck axles, instead of shorter Jeep axles. The fitment wouldn't have been a problem if I was using a YJ frame, as those are 5" wider between the front rails than a CJ-7 frame. (With lessons learned on this project, I'd use a YJ body with the CJ hood and grille and a YJ frame if I were to do this over again.) I looked at outboarding the front springs. Looked at it really hard. I'm not the world's greatest welder, so welding up the brackets scared me a bit. I looked at using ones just like on the Bronco I had (the rear springs are outboarded from the factory), but at $44 each from the dealer, and $45 each from the junkyards (they're held on by 2 bolts and 2 rivets, so the yard would have to cut 'em off for me), plus the fact that the position of the spring would be kinda high on the frame, I was looking at other options. As previously mentioned, while cruising the junkyards one day looking for disk brake parts, I'd found the frame of a 1979 Bronco on top of a van. Well, the suspension on it was still on my mind. After a few discussions with some friends of mine, Chris and Lars, as well as Dad (one of the original Jeepers in this world, and a darned good mechanic) I went back to that yard to find the Bronco frame still sitting there as I'd first seen it, except that some overheated Northwester had pulled the front brakes and steering knuckles off of it. The suspension was intact, but the springs were shot. One looked like a bent slinky, and the other had about a dozen of those screw-in coil spacer thingies that you find in the scary aisle of the parts store. That's fine, as my folks had a 1979 Bronco, and those puppies were HEAVY, thus making those springs no good for my use even if they weren't sprung. (Or is the word "sproinged"?) I went back on two consecutive days (there's one of those repeated themes of mine again) and got the suspension. It's all a bolt-and-nut affair (no rivets), which made it fairly easy to disassemble.

    A big pile of parts, ready for cleaning.

    Side note: Something surprising to me was the fact that the 1979 control arms are a full 10" longer than the ones on my 1984 Bronco with the Twin Traction Beam front suspension. No wonder a lot of lift kits for the TTB include longer arms.

    Another side note: An advantage to a coil spring/control arm suspension on an off-road vehicle is that if the vehicle pulls up to something that will clear under the bumper, such as a log or ledge, the first part of the vehicle that hits is tire, not leaf spring or spring shackle.

    Mounting the Bronco suspension took a bit of work. The 1985 Jeep frame is 36" wide (center of the frame rail to center of the rail) at the rear, and 26" at the front. The transition between widths is between the fixed spring mounts (in reference to the body, the frame flares in the area under where the driver sits). Except for a couple-few inches between the front bumper and the front crossmember, the frame is fully boxed. Where the control arm bracket needs to mount, the inside of the frame rails are parallel, but the outside is just starting its outward bend, so it's angling out towards the rear. The Bronco frame rails are parallel for their entire length. It's modification time.

    I only needed to make the outside of the frame rails parallel; the inside of the rails were already parallel in this area (it's not really necessary for the inside of the rails to be parallel, I guess, but it makes bolting on the brackets a whole lot easier if they are). Using some 2"x2" lumber and every clamp I had, I mocked up where the suspension arms and brackets needed to go. I found that the brackets needed to go right behind the mounts for the front corners of the body tub, and that would still leave me enough room to move the axle forward a couple of inches. Coolness. With that positioning, I need a 13/16" spacer under the front of the plate that I wanted to use for the outside of the frame rail. Gee, if I lay a piece of 1-1/4" angle iron with both edges touching the frame rail, a quick touch of a grinder against the corner that juts out gives me my 13/16". (Hey, all that high school math finally came in handy!) I welded the angle iron on, bent a plate to so that it has about a 4" run along the frame rail from where it touches in back, and fishmouthed the rear end of it before welding it to the frame and the angle iron (everyone that I feel knows anything about frames recommends the fishmouthing whenever you can do it). I then welded plates on the top and bottom of this plate, to make a full box. The back ends of these plates do not extend as far back as the side plate, to keep all the stresses spread out. (If this doesn't make a whole lot of sense, go here for pictures: Front Suspension Mount Pictures).

    After all that, I drilled the holes thru the frame (and thru my new work) for the 1/2" grade 8 bolts I'm using to hold the control arm brackets on. Each bracket has two horizontal holes and two vertical holes. The frontmost of the horizontal holes goes right thru the angle iron. This was not fun to drill, and I destroyed four small drill bits (drilling pilot holes), ripped the end off of a 1/2" bit, and then bent a brand-new 1/2" bit and an 11/16" bit.

    I started this whole process by clamping the brackets in place and measure everything about 17 times. I then put the 1/2" bit into each of the bracket holes and triggered the drill just enough to leave a nice dimple on the frame rail right in the middle of where I needed the holes. Then, I used (for starters) a 1/8" bit to drill a pilot hole thru. After using a few other small bits, since I broke the 1/8" bit on the angle iron, I had my pilot holes. I then removed the brackets and drilled everything out with a 1/2" bit.

    Since just putting the bolts in and cranking 'em down would pinch the frame rails, I needed to put in some spacers. I couldn't find any spacers long enough for what I wanted to do, so I went to the plumbing section of the home improvement place and got some short lengths of 3/8" pipe.

    * Note: Pipe sizes are based off of the old lead pipe sizing standards. For a given "inside diameter" (the size talked about), the outside diameter will be the same, but the inside may not be. In other words, 3/8" internal diameter lead pipe had an outside diameter of 11/16". Iron is a stronger material than lead, so the iron pipe has a thinner wall than the lead pipe, but still has the same outside diameter. Steel is even stronger, so it has even a thinner wall, which yields and even larger inside diameter. The reason the outside measurement stays the same is so that you can use the same screw-on fittings for all pipe that claims to be, in this case, 3/8".

    The pipe that I bought has a 1/2" inside diameter; perfect for 1/2" bolts. (I picked it out because of the 1/2" inside measurement. It just so happened that the outside diameter is 11/16", which is called 3/8" pipe per the lead pipe standard.) I cut the pipe into sections about 1/4" longer than I needed, ground one end flat and square, then ran a 1/2" drill bit thru the small pieces of pipe to clean out the welding spur inside the pipe so that the bolts would pass thru. That's right, the pipe I bought is welded tube, so it had a line of welding spur down the length of the inside.

    The next step was to use the 11/16" drill bit and re-drill almost all the holes. I drilled the ones on the bottom of the frame rails, but left alone their partners on the top of the frame rails. I then drilled the horizontal holes, thru all the various layers of metal, leaving the ones on the inside surface of the frame rails alone. The reason for leaving the surface of the frame furthest from the bracket, is so that the spacer will be clamped between the bracket and the frame, and thus can't slide out the other side if the frame gets compressed at all.

    * Note: When drilling this setup, remember that the center line of the drill is going square thru the outer plate and the frame rail, but is at a 45-degree angle to the surface of the angle iron. In other words, BE CAREFUL. I've yet to see a drill bit with an angle on the end that is steeper than 45 degrees; they're all quite a bit less than 45 degrees (actually, according to my junior high shop teacher, most are 23 degrees). What this means is that the edge of the drill bit is going to start cutting before the center of the bit makes contact with the metal. Go slowly, use a light touch, and get a good grip on the drill with both hands. As in the text above, I bent a very large drill bit while drilling these holes. If you don't have a really good hold on the drill, you can get hurt when the bit binds.

    The end result.

    Now that I had all the holes drilled, I put the spacers in (nice end in), tapped 'em all the way in with a hammer, then used the small hand grinder to make 'em flush with the frame rail. This way, each spacer perfectly fits its location. (If I ever find myself taking this thing apart, I'll have to remember to mark the spacers, so I put them back in the exact same places.) I then bolted everything together, using big flat washers under both the bolt heads and the nuts.

    Cuttin' spacers.

    I had to weld the C-brackets back onto the front axle, but I didn't feel too bad 'bout having taken them off for the original suspension plan, since they had to go on closer to the middle of the axle anyway to make up for the narrower CJ frame. (I would not have had to move them if I'd been using a YJ frame.) I put the front axle in, with the brackets just being pinched in the suspension arms and the C-bushings. (C-bushings are the rubber, or in my case, polyurethane pieces that fit around the axle brackets adn are then clamped inside the end of the radius arms.) I then did a lot of tapping with a hammer and checking with an angle finder to get the caster angle set to where I thought I wanted it. I then let it set for awhile, checking the angles a few days later. (I find I do better if I measure up something, leave it alone for a few days, then go back and check my measurements again later, when a friend is looking over my shoulder.) I put a quick tack weld on each of the brackets to hold them in place on the axle tube, then I pulled the axle and finished the welding. After everything cooled down, it was time for some more Hammerite paint.

    While all this was going on, I had the rear axle housing sitting across the rear springs, just to get an overall look at things while working on the front axle housing. I'm gonna need some major fender flares, 'cause this thing is gonna be wide...


    Mounting the spring towers ended up working differently that I had initially imagined. The spring towers go over the area of the frame rails where the original shock towers had bolted on. The shock tower holes measured 3/8", and had been sleeved from the factory. What I found interesting, is the fact that the sleeves are a bit larger than 1/2" inside diameter. One of the holes was within 1/8" of where one of the four holes in the spring tower was when I clamped it into position. I drilled out both the frame hole and the 7/16" hole in the spring tower to 1/2". I put a bolt thru (grade 8, with washers and nut), and drilled out one of the other shock tower/frame holes to 1/2", and put a matching hole in the spring tower (this just happened to be near the middle of the tower). With two bolts now holding each tower in place (rear and middle of the towers), I found a spot on the frame rail near the front of the spring tower, and drilled and sleeved it for a third 1/2" grade 8 bolt.

    Oh, if you're wondering; the front fender still fits just fine, as the spring tower bends outwards a little bit just above where it mounts to the frame rail. Also, if you've noticed, I'm using all 1/2" bolts. Not only are the 1/2" bolts stronger than the stock stuff because of its larger size, having all of the bolts the same size allows an amount of interchangeability. In other words, I can carry a set of various length 1/2" bolts in my on-board parts kit, and be able to replace pretty much any bolt that should happen to break.


    I've probably learned more about Ford F-series coil springs that I'd ever want to after this project. (I had looked at TJ, XJ, and Ford Ranger springs, but they were the wrong size to fit the spring mounts I have.) What I found was that Ford 4x4 trucks with a straight front axle (1979 and earlier) use a spring that measures 5-1/4" outside diameter, about 16" relaxed length, and the top coil is bent in towards the center of the coil to meet the spring retaining strap on the spring tower (this short section is actually straight). The bottom of these springs don't do anything special; they don't narrow in diameter, or have the last turn bent up or cut thinner, like on some other trucks. All other Ford F-series trucks (2wd and TTB-type 4x4) run a very similar spring, but think of it as being upside-down as compared to the straight-axle 4x4 spring. The top is left alone, but the last coil on the bottom twists in tighter (it's curved, as opposed to straight like on the early 4x4 spring). It's retained on the bottom with a big washer and nut.


    I obtained a nice set of coil springs from a 2wd 1976 F-100. My only concern is if these springs will be long enough to provide the ride height I want. (This is hard to engineer ahead of time, since I can't find any source of spring rates for truck coil springs.) To mount the springs, I flipped them upside down. Despite the fact that the now-top of the 2wd/TTB spring is a bit different than the old, it took a bit more work to get the top retainer mounted (the curved end versus the straight end, as mentioned before). Despite that, it seems to work just fine for now. The bottom spring retainer fits perfectly.

    The F-100 springs are temporary. They're a couple of inches short right now as things stand, and that's without the weight of the front sheetmetal, engine, or other underhood components. I'm looking at using a set of early Bronco lift springs, as that's a comparable vehicle as far as weight, and they'll fit the suspension mounts perfectly.

    Radius arm bracket all bolted up. Another shot of the rear end of the radius arm.

    The front of the radius arm.

    Another shot of the passenger side assembly.

    The next things I needed to start on was the track bar setup and the shock mounts.

    The right-hand suspension arm had a lower shock mount ready to go. It's basically two bent plates that are riveted thru two holes in the arm, right behind the axle. (You can see this is the last of the pictures above.) The left arm had the two holes, but no plates. Instead, the shock originally bolted to a projection on the front of the cap piece of the arm, so it was in front of the axle. Since that projection gets in the way of how I'm setting up the tie rod (and since I thought it looks funny having on shock in front of the axle and one behind), I cut off the projection and ground it smooth. I then bent some pieces of plate steel into brackets, matching the ones on the right suspension arm as closely as I could. Since I don't have a way to rivet the plates on, I bolted them on with some 7/16" grade 8 bolts and nuts.

    I looked at using the factory shock towers in a relocated position, but since Jeep put the factory lower shock mounts so low on the axle, the stock towers aren't nearly tall enough. Instead, I bought some front shock towers meant for a 1986-1996 (and maybe even later) Ford F-250 or F-350 truck. At $13.02 each, I was more than willing to buy nice, new, un-rusty ones than spend $10-$15 each plus gas and time at the junkyards for rusty used ones. When I first held these mounts up to the frame, the length on them was perfect.

    F-250/350 shock towers.

    I put the shock mounts one inch behind the spring towers, with the bottoms of both towers even with each other. Alignment was easy; I put a 1" wide block of wood between the spring tower and the shock tower, then clamped everything in place. Once again, I found myself drilling the frame for bolts. This time, I only drilled two 1/2" holes thru both sides of the boxed frame. A factory hole in the frame rail was close enough that I could use it to put in some tube spacers to keep the 1/2", grade-8 bolts from crushing the frame when I tightened 'em down. Then, all I had to do was to bolt up the shocks.

    (For the part number on the shock towers, check here: Part Numbers.)

    The track bar is going to take more work than the shocks. Leaf spring suspensions can live without a track bar (often called a panhard rod), but coil setups requre a track bar or some other kind of triangulation (such as A-arms or a triangular link). Without the track bar, the front end of the Jeep will slide off kinda sideways, even if it's sitting still, and would be totally uncontrollable to drive. The track bar that came with the front axle is about a foot too long.

    Here's a bit of theory: Ideally, the track bar should be as long as possible, and should be the same length as the steering draglink, as well as being exactly parallel to the draglink. This eliminates as much bump steer as possible.

    When I say "parallel" here, I'm talking about an imaginary line that runs from the center of one end of the link to the other. (If the link bar is perfectly straight, then this line would be running right thru the centerline of the bar.) So, really, I'm talking about parallel between this imaginary line on the draglink and the same kind of imaginary line on the trackbar. The "length" would be the measurement along these imaginary lines from pivot point to pivot point. The reason I bring this up, is that a lot of track bars have a bend in them, so that they clear oil pans or differentials. Also, there's a lot of extremely bent draglinks (the "Z-Link" is a popular one). Many companies make the bogus claim that these track bars eliminate bump steer. Really, all a bent draglink does is clear stuff under the truck, like the oil pan or suspension pieces. Installing a bent track bar does not change the location of the pivot points, and thus has the same resulting geometry as a straight track bar; it has no effect on bump steer at all.

    I found a 1966 Bronco (the early style) in the same junkyard that I purchased the axles from last summer. I'd already pulled the transfer case out of this Bronco on an earlier trip, and on my second trip, I pulled the driveshafts and the track bar, the latter of which appears to be just the right length for my Jeep. I had originally thought about using the track bar that came with the front axle, but $10 for the early Bronco track bar was less than I'd spend on having the long one shortened. The rubber bushings in the Bronco trackbar are shot (I can't complain; they were 34 years old). I replaced them with polyurethane, just like I have with every other piece of suspension rubber.

    The axle end of the track bar was the easiest to figure out; I used the heavy cast bracket that was the original mount for the steering ram. For U-bolts, I used two of the U-bolts that were provided for holding the axle to my now not-used front leaf springs. These U-bolts are bent from thicker rod than the originals (as well as being brand-new), so once again, I got out the big drill and drilled out the holes in the bracket from 5/16" to 3/8". I also had to drill out the hole for the track bar bolt, as that hole was originally tapered.

    Recycled bracket from the ram-assist power steering, now doing duty as a track bar mount.
    Track bar bracket on the front axle.

    The frame bracket for the track bar on the early Bronco that I had pulled the bar from had been welded onto the frame by some previous owner (as had all the suspension brackets), so I needed to find an alternative.

    The solution came from the same big Bronco frame that I goten the front suspension parts and axle knuckles from. On the 1978/1979 Broncos, the left front shock tower drops below the frame rail and is notched and drilled in the extended lower end so that it can also act as the frame mount for the track bar. I hadn't gotten the shock towers from this frame when I got the suspension, as they're set up for the kind of shocks that have the threaded pin on the top end that goes vertically thru the mounts, and because these mounts are a couple of inches taller than the spring towers as well as leaning outwards a lot. However, this mount is really thick (7/32" steel) and is forged from one piece. Since the track bar is one of only three links in this suspension setup, and welds can fail, I liked the idea that it's not welded from three plates, like most aftermarket mounts are. What I did was cut off the part of the shock mount that exteneded above the frame rail, and used that scrap to box out the lower part.


    After all of this mess for the front suspension, I decided to go simple with the rear suspension.

    At least, initially.

    If you've been following this site for very long, you'll know that at first, I was planning on using the rear springs from the lift kit that I had purchased in the conventional, stock, spring-under-axle configuration (typically abbreviated as SUA). The plan was to start there, then once the Jeep got moving, change it to an SOA (spring-over-axle) later, along with lifting the front. Well, that changed. I'll explain the new in just a bit; let me go over how I planned on doing the SUA first.


    For the spring-under I picked up a pair of Dodge rear spring U-bolt plates that go over the axle tube, not the springs. Instead of being flat, like most spring plates, these have a curve in them, as they're designed to fit around a 3-inch axle tube. With these, I could use square U-bolts, so that the threaded ends of the U-bolts would point up, instead of down. (The advantage to having the bolts point up is that the ends don't get dinged up or snag on anything.) One plate came off of a eighty-something Ram Charger, and it's mirror image came off of a late 1980's or early 1990's Dodge half-ton truck. I've seen these used before for flipping the U-bolts, and I think it's a great low-buck idea. The Dodge trucks' rear axles have a 3" outside tube diameter, just like the Ford 9" I was using initially (or a Dana 44 or an AMC Model 20), and the leaf springs on both the Dodges and the Jeep are 2-1/2" wide, so these plates are a perfect fit.

    Beyond that, all I needed to work out for the rear suspension was mounting the shocks. While my dad was visiting, we took a good look at the rear suspension. The original rear shocks were mounted inside the frame rail so that there'd be tire clearance in the wheelwell. This isn't a problem for me, since both my first and second rear axles are at least 6" wider than the original axle that was in this Jeep. The original frame mounts for the shocks are only a couple of inches high, and are canted forwards. The original axle mounts hung a couple of inches below the axle housing. What Dad and I decided would work best is to use the original front shock towers (about 8" long) in the rear, with the towers extending into the wheelwell. Then, the axle mounts for the shocks would be welded onto the front of the axle housing, and thus wouldn't stick down from the axle. Cleaner look, and less likelyhood of hanging up on something when off-road.


    That was the first suspension idea. Then, something Lars said came back to me. Namely, "Why build something twice?" In other words, if I planned on going SOA, why not just do it now?

    It's a really good point, and has applied to a lot of other things in this Jeep build-up.

    Chris backed him up, as did my dad.

    Also, at this point, I'd run into the fact that the first axle I had purchased just wasn't going to work with the front leaf springs. (You can check it out on the axles page for full info, but basically, all the parts on it turned out to be garbage.) I purchased another, later version of the Ford 9" axle. This outside tube diameter on this one measures 3-1/4", instead of 3", like the previous axle. This means that the U-bolts that came with the suspension kit are too small. By going SOA, my spring plates aren't usable, as not only are they for a smaller axle diameter, using them would put the U-bolts pointing down again, which I've been trying to avoid.

    With the SOA configuration, all I needed for each spring plate was a flat metal plate with five holes drilled in it; four for the U-bolt ends, and one in the middle to clear the center pin on the spring. (The Dodge spring plates weren't a total write-off; the U-bolt holes in them were spaced correctly, so I used one as a pattern for drilling out my new home-made spring plates.)

    In preparation for the SOA, I removed the center pins from the springs to turn them the other way around. The center pins are a high-quality 3/8" bolt with a round head that bulges in the middle; it looks like a slightly-flattened ball. A plain, old-fashioned hex nut threads onto the other end of this pin/bolt. However, despite clamping the leaves of the springs together before removing the pin, I didn't get them out without ripping off all the threads. No bit deal; I got new ones for less than a buck each at the spring shop. I also had new U-bolts made up while I was there. Instead of 1/2", I had 5/8" ones made up for less than a buck more. If you do the math, you'll see that a 5/8" bolt has a cross section that's 56.25% larger than a 1/2" bolt. That's a lot stronger for very little more money, and I feel was worth it (but I will agree that it wasn't really necessary). Also, the nuts that came with these U-bolts are twice as thick and a lot better quality that the stock stuff, so that weak point has been lessened.

    Suspension kit/stock style half-inch U-bolt on the left, custom bent 5/8-inch U-bolt on the right.
    U-bolt comparison.


    *Note: Buy your U-bolts, don't make them yourself. I've had guys tell me "You don't need to spend nine or ten bucks on a U-bolt, just get some all-thread (slang for threaded rod) from the hardware store, heat it with a torch, and bend it around the axle." If you do that, I don't want to be on the same road with you. Threaded rod is equivalent to a grade 2 bolt. Proper U-bolts are grade 8. Big difference in strenth right there. Also, proper U-bolts don't have threads in the area of the bend. Why? Because when you bend a rod/bolt/anything in an area where there's threads, the inside of the threads become tiny cracks. I know there's guys that have done this, and supposedly haven't had a problem, but I stand firm on buy proper U-bolts. This is cheap insurance; for you, everyone else in your vehicle, and everyone else on the road.


    I cut the spring pads off of the rear axle, as they were too far apart and angled wrong. Instead of making new ones, I purchased some Moroso pads from a local 4x4 parts place. Then, in the process of putting things together, I decided to re-drill the pads, to mount the rear axle back one inch. This will facilitate cutting the body to fit bigger tires, since there's more room to the rear of the rear wheel wells for cutting than there is to the front. By only moving an inch, I gained some cutting space, but still clear the gas tank upon compression of the rear suspension. As a smaller point, this gives me just a smidge more rear drive shaft length, which we all know is in short supply on a CJ.

    Below is what I started this project with; a piece of 1/4" steel plate and the two Moroso spring pads.

    Raw plate stock, two new pads (left and center), and one old one.
    Starting materials.



    Originally, I was going to use Dodge spring plates, with square U-bolts, in a stock-style spring-under suspension. This would have put the U-bolt ends pointing up, where they wouldn't snag or get the threads dinged. These are pretty cool to use; they're set up for a 2-1/2" wide spring, and have the curve for a 3-1/4" axle tube bent into them.

    However, I finally got talked into going spring-over. (Thanks, Lars and Chris.) The quote from Lars was "Why bother to build something twice?". Chris backed him up.

    It's a really good point.

    The Dodge spring plates weren't a total write-off; the holes in them were spaced correctly, so I used one as a pattern for drilling out my new home-made spring plates.

    Below, you can see me drilling out a 4"x5" piece of 1/4" steel, to make the U-bolt spring plate. In the picture, you can see the new plate under the Dodge "template".

    Dodge 1/2-ton spring plate being used as a jig.
    Drilling the U-bolt holes.



    The next step was to find the center of the plates as referenced by the holes. I did this by first drilling out all of the holes to 5/8", the same size as my U-bolts, then put some temporary bolts into the holes. Using some old drafting tricks, I scribed a set of lines that gave me a set of X's that let me draw a pair of center lines.

    Initial layout lines in black,
 new center lines in red.
    Construction lines.



    After finding the centerline of the pads themselves, I center punched a spot one inch forward from center one just one pad, then drilled a pilot hole. I then bolted the two pads together (just like I did for the plates), and drilled the pilot hole all the way thru. I then drilled the hole out to 1/2". By drilling both pads together, they're a perfect match.

    The axle pads, bolted together, and being drilled.
    Drilling the pilot holes.



    The end result is that I have two pads and two plates with offset holes for the spring centering pin.

    The end resulting pieces.
    Everything all drilled out.



    Here's what it looks like all bolted up. You can clearly see the grinding marks on the axle from where I took off the old spring pad. (You can also see the overly-long spring center pin sticking up thru the hole in the plate.)

    Everything bolted up, ready for adjustment and welding.
    The parts bolted together.



    The next step is to make sure the pinion angle is set correctly, and then to weld the pads to the axle. That's going to have to wait until I get the rest of the drivetrain and roll cage in the Jeep, so I know what I'm aiming at, and where the suspension is going to sit. Also, I'll be welding a shock mount onto the spring plate. As you can see, with a plate this size, it would be very easy to add a second shock mount if I decide to set up a double-shock system.


  • Suspension Costs

    Click to see my costs so far.


    The Rest of the Suspension

    We'll just have to see what happens. I'll update this page as I figure stuff out/get stuff done.


    (To go back a page, click here.)