Here I am

Time for tricked out rear suspension...

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Ok guys, I decided that I can't deal with the harsh ride of my truck anymore. It has 3/4 ton springs + add-a-leafs = STIFF RIDE I have been driving around a Cadillac Escalade for a few weeks and man I tell ya... I get in my truck and it's like YUK! Soooo rough. I know its not a fair comparison but I also need another inch and a half of lift to run the new 38x15. 50x20 tires I got. The 37's fit well now but the extra width will require more lift. I already have 2" blocks + the stock blocks so more block is a no-go for sure. I looked at lift springs but they are usually pretty stiff too and if I don't go 3/4 ton springs, I lose the payload. I do tow with this truck. So I tought about doing a load airbag assist or something with 1/2 ton lift springs but the lift springs are $$$$$ and the bags are another $$ or so. So thats about 700. 00. Thats not even considering what my truck might do to 1/2 ton springs as far as spring wrap from TQ. I figured that was too much to spend considering for that I could 4 link and bag the rear and it would work and ride a lot better not to mention eliminate any chance of axle wrap.

Here is the plan. I am going to start with some LARGE Rubicon Express bushings and also Large Rubicon Express Super Flex Joints. Add some 1 1/2 . 250 wall DOM and end up with some nice upper and lower control arms. Getting some link mounts from Poly Performance for the frame and axle. I'm going to use 1 1/2 DOM to build a new drop cage for some airbag and shock mounts. Mount a 5 gallon stainless steel tank and compressor under the bed and a controller in the engine compartment (don't want cab clutter).

It will have 4 control arms and a track bar. The bags will be 2600# Firestones, Bilstein shocks, and all DOM and Rubicon Express components. The suspension linkage will basically be a copy of the long arm set up that I did in the front. I think it will give me the best of all worlds and I plan to document it all here so others can possibly benefit from it. I should end up with the ride height I want, the ability to carry weight in the bed, tow as good as it does now, have no axle wrap, and most importantly, feel soft on the road unloaded. I will also add the stock rear sway bar as my truck doesn't have one on it.

Any input throughout this endeavor is welcome...

Let the games begin!
 
I have several thoughts on this matter. Since I do not possess the fabrication skills to do a project of this level I guess it is all just theoretical on my part. So here are some ideas to ponder.



1. Rectagular tubing would give you stiffer components than round tubing. A thinner wall thickness would give similar strength and reduce unsprung weight.



2. If you match the length of the links to the length of the driveshaft you should be able to avoid ujoint problems. Also running the upper and lower links at different lengths could keep the ujoint alignment correct thru the arc of the axles travel.



3. A 3 link setup with a triangle shaped upper link (to locate axle side to side)

would provide better wheel travel and be simpler to fabricate than the 5 link you described.



4. Stick your head under a 1960-66 Chev 1/2 ton pickup. These things had a factory rear suspension with really long arms and coil springs. Nicest riding trucks I have ever owned! It might be really simple to recreate this basic setup under your truck.



Please keep us informed as your project progresses. I was out at the T/REX website and thought thier prices for the rear air suspension were pretty reasonable for the amount of engineering it would take to build your own.



Phil
 
ASTAR said:
the lift springs are $$$$$ and the bags are another $$ or so. So thats about 700. 00.



Cool Took me a while but I forgot to carry the 2 :-laf



Anyhow. Isn't Drawn Over Mandrel stronger than square?



Couldn't a simple Locator rod like some mud racers use work rather than doing a 4 link? (Rod that goes from front spring perch to the center bolt area of the leaf pack. It moved in the same arch and eliminates wrap.
 
---The T-REX system uses schedule 40 pipe and IMO that is nothing to be building suspension parts out of... .



you should contact BBD as he built a killer 4 link system for his truck... chris
 
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Let me show some more ignorance here. Is DOM tubing only made in round? For some reason I had it in my head that it was available in other shapes. An oval would be a good shape for suspension links with the tall part oriented vertically.



Phil
 
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