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#1 02-24-2012 11:12:43

gentle
Helper
Registered: 10-05-2008
Posts: 23

Rear Leaf Springs

I am getting ready to change the rear springs on my XJ and I thought that I saw somebody say that stock Dodge Ram springs will fit and also give some lift. I am not really worried about ride. I figured that I could use those and shackles in the back and either taller springs or blocks in the front. If that is not the case then I will just go with stock springs and a small lift kit later. This is my DD and it is a 96. As always thanks for the help.

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02-24-2012 11:12:43

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Re: Rear Leaf Springs

#2 02-24-2012 11:37:00

james
Rookie
Registered: 10-05-2008
Posts: 90

Re: Rear Leaf Springs

I was the originator of the Dodge packs. Think it over before doing it, as a bit of research is needed, a little modification, and a bit of fine-tuning may be needed.


-Choosing the springs: Physically, all of the 1/2 and 3/4 ton springs through the 70's and 80's, and even the 1st gen. Ram (90's) body style will work. These springs came in several heights and spring rates though, depending on whether 4x2 or 4x4, and 1/2 or 3/4 ton, and even individual option package. I have found 2wd springs from a 70's truck, with the overload spring removed worked pretty well. I used 4-leaf packs, so if you get packs with more leafs, just remove the shortest leafs until you are left with the 4 longest leafs. This setup should get you around 3-4" lift and a slightly firmer than stock ride, but not harsh at all. Use soft shocks to reduce harshness...I just use cheap Ford pickup rear shocks.

-Fitment: There are 3 places where the Dodge packs differ from XJ:
1. The center pin is off by 1". This is easy to remedy by rounding out one of the extra holes in your axle spring pad so the center pin can sit there.  A die grinder or even a dremel and patience will work for that.

2. The stock Dodge spring eye steel bushings are a hair too tight for the XJ bolts to pass through. You can drill out the bushings, or find different bushings the right size. The difference is because XJs use metric bolts, and Dodge didn't. I believe the newer Rams (90's) used metric bolts, so maybe their springs would work better, but I don't know the dimensions to know for sure.

3. The Dodge spring eye bushings are aprox. 1/8" narrower than the XJ. I just installed 1 or 2 washers (as needed) on each side of the bushing.

It sounds like a lot, but really isn't too bad. For the improved ride, and the fact that Dodge packs seem to never sag out like stock (or replacement) XJ packs do, its worth it to me. I've logged probably 100k miles total with Dodge packs in the rear of XJs, and I'll keep doing it as long as there are Dodge packs left! Although the set thats sitting under my old XJ has been used in 3 XJs total, and are still going strong, and will be used in my next project.

As you can see, if you are looking for a bolt-in spring, these aren't it. They do require a little work. Up to you whether you have the time/tools/ability to try them.

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#3 02-24-2012 11:41:16

gentle
Helper
Registered: 10-05-2008
Posts: 23

Re: Rear Leaf Springs

Sounds like it is little more work than I wanted to do. Not that I am opposed to doing the work but I was hoping for something that was bolt in. I have to get the "toy" going so it is ready for SF and it needs a fair amount of work.  I feel like I could work every weekend from now until then and not get it ready. Sure everybody feels that way though.   Do you or anybody know of springs from another app that would bolt in? If not I will probably go stock.

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#4 02-24-2012 11:41:42

Strawman
Helper
Registered: 04-12-2009
Posts: 15

Re: Rear Leaf Springs

The S10 spring pack swap seems to be popular around here. I have not done it and I don't know the details.  I assume it is similar to the Dodge swap.

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02-24-2012 11:41:42

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Re: Rear Leaf Springs

#5 02-24-2012 13:09:05

Jose
Helper
Registered: 04-13-2009
Posts: 28

Re: Rear Leaf Springs

Isn't there some Dakota springs that can be used without modification? unsure of the years to be used

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#6 02-24-2012 13:34:04

acs88xj
Helper
Registered: 12-05-2009
Posts: 43

Re: Rear Leaf Springs

stock xj rears differ by year and options. my '94 feels considerably
firmer than my gf's '01.

there's a data file of them complete with p/n on one of the online forums.

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