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Old 03-24-2012, 07:01 PM   #1
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Wat springs should i use for 8inch stretch in rear

I have an 89 yj with one tons. im a good welder and fabricator. im curious to know which springs i could use to get 8 inchs of stretch while getting the max amount of flex at the same time. i have the comp fenders and a fuel cell already. i have 6inchs in the front and i want to make sure there is at least 8 in the back

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Old 03-24-2012, 08:39 PM   #2
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Coil springs, and a 4 link....

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Old 03-24-2012, 08:47 PM   #3
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Coil springs, and a 4 link....
This x4!
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Old 03-24-2012, 08:59 PM   #4
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at this time i cant affoard to finish my motor build. so i deff cant affoard 4 link and coils. and im also in the middle of a 3 link in the front. i meant along the lines of which leaf springs
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Old 03-24-2012, 09:37 PM   #5
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you would need to cut and stretch the frame.
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Old 03-24-2012, 09:38 PM   #6
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none, the most you can realistically and safely get is 2" off Waggy springs.
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Old 03-24-2012, 09:50 PM   #7
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most ive ever heard of is a 5ish inch stretch from flipped XJ rear springs
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Old 03-24-2012, 10:03 PM   #8
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I disagree with 2xs. and i guess i can settle for 4-5 inchs in the rear :/ ill just cut out the stock rear crossmember and weld a nice thick piece of steel back there and weld some perchs on
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Old 03-24-2012, 10:12 PM   #9
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Do you want lift or stretch?
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Old 03-24-2012, 11:01 PM   #10
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I disagree with 2xs. and i guess i can settle for 4-5 inchs in the rear :/ ill just cut out the stock rear crossmember and weld a nice thick piece of steel back there and weld some perchs on

Dont care if you disagree with me, but your ride wont be safe, dont take it on the freeway, Since your doing a 3 link in the front, I guess your not too concerned with on road anyways!
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Old 03-25-2012, 11:41 AM   #11
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im gonna settle for the cherokee springs put on backwards so its 4inchs of stretch. when i can affoard it i will go 4 link in the back and keep the 3 link in the front.
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Old 03-25-2012, 11:42 AM   #12
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So you don't have the money to finish the engine, or front end. But you got enough to build the rear?
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Old 03-25-2012, 11:47 AM   #13
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Haha this is me just brain storming and getting different ideas. I already have all the stuff for the front suspension that i baught a few months ago. I only did a motor swap because i found a really good deal on a really good motor. the only reason i am doing the stretch because i want a nice long driveshaft in the rear instead of a little stubby. for the time being i will try and get away with just triming back my driveshaft and rewelding it for the time being just to get some road testing in and make my needed adjustments. i will probably tune my leaf spring suspension just so i can have my fun till i can affoard to finish everything else. the rear suspension is most likely the last thing on my to do list and i would like to pull it out of the garage so i have room to work.
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Old 03-25-2012, 01:04 PM   #14
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Quote:
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Haha this is me just brain storming and getting different ideas. I already have all the stuff for the front suspension that i baught a few months ago. I only did a motor swap because i found a really good deal on a really good motor. the only reason i am doing the stretch because i want a nice long driveshaft in the rear instead of a little stubby. for the time being i will try and get away with just triming back my driveshaft and rewelding it for the time being just to get some road testing in and make my needed adjustments. i will probably tune my leaf spring suspension just so i can have my fun till i can affoard to finish everything else. the rear suspension is most likely the last thing on my to do list and i would like to pull it out of the garage so i have room to work.
Youre stretching so you can have a long driveshaft? That makes no sense

You stretch for wheelbase and departure angle. Id focus on one thing at a time I.e (motor, suspension).
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Old 03-25-2012, 01:22 PM   #15
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The motor situation is completely figured out, the only thing stopping me from being done is funding. But while im at school i figured i do some Solid works drawing and make some adjustments and see how everything moves and works on articulation. i can usually tell my articulation before i finish the truck
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Old 03-25-2012, 01:26 PM   #16
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IMO: do it once, and do it right, Since your doing a rear 4 link, do it once, I wouldnt mess around with any other configuration, and if you only want garage space, the current rear will work.

Just curious, what engine/trans/Tcase are you using?
Telling us a great deal on a really good motor doesnt give us much information.
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Old 03-25-2012, 01:31 PM   #17
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I say one link it, easier to work on, cheaper, and arguably stronger...here's 52 inches under a 42" tire and it would go further

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Old 03-25-2012, 01:41 PM   #18
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in my opinion its a good motor. 6.0 vortec 450hp, custom built turbo 350 rated for over 600 hp and then for the time being my built up np231 until i can affoard better. I want the truck up and running since its the only time im home from college. This is all speculation as ive said.
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Old 03-25-2012, 03:07 PM   #19
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Go XJ front and rear with a soa setup, thats what I am doing with a hp44/ff60 combo (538 geared)
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Old 03-25-2012, 04:38 PM   #20
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in my opinion its a good motor. 6.0 vortec 450hp, custom built turbo 350 rated for over 600 hp and then for the time being my built up np231 until i can affoard better. I want the truck up and running since its the only time im home from college. This is all speculation as ive said.
Then just stick to your current setup outback and save for links, youll thank yourself, links>leafs completely.
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Old 03-25-2012, 05:32 PM   #21
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For some reason it wouldn't let me attach the pic to your last PM so here ya go. Basically it has one huge joint in the front and none in the back. The back of the Y goes on stock leaf spring perches with a center bolt like the leafs to do locate it. You use the stock ubolts and spring plates to fasten it down. The trackbar as you can see is pretty basic with a heim on both ends, or you can do like I did and heim one side and boulder bushing the other. The bottom coil mounts come off the backside of the wishbone bars. We have done 4 this way and have yet to have a failure, and they drive just fine going down the road as well. When I do my next rig it will have wishbones front and back (but that's really hard to do with you have an offset front axle). The front is attached to a new crossmember. This setup maximizes travel because your only having to align one joint instead of 4, it works as a set of traction bars, and you can drag it over rocks all day everyday and it won't bend while protecting your driveshaft.

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Old 03-25-2012, 07:53 PM   #22
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that sounds so scarey that one single joint and one single bolt is holding everything in?? what size joint is it?? and can you get me a close up of both the front connection and the rear connections
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Old 03-25-2012, 08:07 PM   #23
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LOL it will hold.....we have used: 1.25 chromoly heim, 3" johnny joint, a grader ball, or even a 2 5/16" trailer ball (not for street use)

I can't of mine because I sold it a month ago, but I can of another one I did...might be a few days though
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Old 03-25-2012, 08:25 PM   #24
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Ok so as long as i ensure that both sides are exactly the same to the 1/16 of an inch the rear axle will track straight and everything will be good. that does appear to be reletively easy to make.
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Old 03-25-2012, 08:31 PM   #25
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Pretty much
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Old 03-25-2012, 08:35 PM   #26
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the only part i dont understand is how 1 hiem can be stronger then 4. sure its a lot bigger then the others but im not understanding that.
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Old 03-25-2012, 08:43 PM   #27
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the only part i dont understand is how 1 hiem can be stronger then 4. sure its a lot bigger then the others but im not understanding that.
Its a ton of force on one joint.
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Old 03-25-2012, 08:45 PM   #28
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exactly so doesnt that make it super likely to fail and for the joint to fail
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Old 03-25-2012, 08:45 PM   #29
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I never said the one joint was stronger, I said as a whole assembly its arguably stronger. All I can tell you is that we have beat on them for 12 years and haven't replaced a single thing....and thats with 500+ horsepower and 44 inch tires

edit: google franken heim....500,000 psi should be enough.
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Old 03-25-2012, 08:52 PM   #30
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So should i basically just buy the biggest joint possible and then toss it in there? is there a such thing as too big?

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