DirtyComanche Posted October 1, 2007 Share Posted October 1, 2007 I've got 12-13" of free space for the coil at intended ride height... But it has to hold the weight of the truck... I'm thinking a TJ rear is 12" free. So, maybe a TJ 3" lift coil? How long is a stock XJ/MJ front coil? (Gave mine away...) Link to comment Share on other sites More sharing options...
Motion Offroad Posted October 1, 2007 Share Posted October 1, 2007 You'll need to consider the spring rate of the coil going in. Overall length of a coil is somewhat irrelevant. For instance a RE 3.5" XJ coil and a RE 5.5" XJ coil are only 1/2" difference in overall length. Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 1, 2007 Author Share Posted October 1, 2007 True, but I need something in the right range before I even look at the rate. I already know a stock TJ is too short. I was hoping people would throw out ideas of coils I could nab from the boneyard to start trying things... I know, I should just calculate my leafs' rate and measure the difference between loaded and unloaded to determine the weight on my rear axle... But yeah. Sounds like a lot of work right now. I wonder how you figure out when your leaf springs have hit the zero load point anyways? If I jack off the frame they'll unload, but the unsprung weight makes it impossible to tell when... Durr... Haven't a clue right now. Maybe I should scale it again. Or maybe it was 800kg in the rear last time. I've lost myself :dunce: Link to comment Share on other sites More sharing options...
beaterjeep Posted October 1, 2007 Share Posted October 1, 2007 If I jack off the frame they'll unload.I've lost myself :dunce: WOAH, easy there, this is a family oriented forum you know. :eek: Sorry, couldn't help myself on that one. :brows: Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 1, 2007 Author Share Posted October 1, 2007 Guess I should have said "jack up". :nuts: Hopefully nobody was permanently scarred. Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 1, 2007 Author Share Posted October 1, 2007 800kg rear, 1100kg front... Or 4180lbs total. That was with me in it and gear, a full interior and the old front end and no exo. That's close enough. So, 1760lbs on the rear axle. 880lbs per coil. What else do I need to know? My current spring-rate I guess. Blah. Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 1, 2007 Author Share Posted October 1, 2007 Apparently my rears are 150lbs/in. I think the calculator is flawed. Let's go with 160. Link to comment Share on other sites More sharing options...
87manche Posted October 1, 2007 Share Posted October 1, 2007 I was looking at ford aerostar front coils for the rear. Or airbags. Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 2, 2007 Author Share Posted October 2, 2007 Did you take any measurements of the aerostar ones? I could get them pretty easy. There's one down the street. Wonder how easy they are to take off... ;) Link to comment Share on other sites More sharing options...
feerocknok Posted October 2, 2007 Share Posted October 2, 2007 Front JK coils should be long enough, but maybe too stiff. And I think the rears on em are about the same length as our fronts, but no idea on rates. Grand Vitara and Sidekick rear coils should be about 13" without weight if memory serves me right of a buddies. Those are soft. Everything else I can think of is too short. Link to comment Share on other sites More sharing options...
jared Posted October 2, 2007 Share Posted October 2, 2007 yeah definatly the rear jk 4dr ones are pretty beefy compared to tj stuff. a guy at work just lifted his new jk 4 dr. i can get you a measurement if you want one? front and rears springs Link to comment Share on other sites More sharing options...
87manche Posted October 2, 2007 Share Posted October 2, 2007 someone is sending me some stock rear TJ coils. I'll get measurements and pose them in the rear frame arches when they show up. Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 3, 2007 Author Share Posted October 3, 2007 I have a set of stock TJ rears. They definatly don't work. I'll pick up some ZJ fronts and TJ fronts within the week... One of them might work. Jared, measure the JK ones if you have a chance... Free length, coil thickness, number of coils, coil width... I can figure them out with that much. Link to comment Share on other sites More sharing options...
jared Posted October 3, 2007 Share Posted October 3, 2007 I have a set of stock TJ rears. They definatly don't work. I'll pick up some ZJ fronts and TJ fronts within the week... One of them might work. Jared, measure the JK ones if you have a chance... Free length, coil thickness, number of coils, coil width... I can figure them out with that much. ok will do if i can still get a hold of them Link to comment Share on other sites More sharing options...
feerocknok Posted October 3, 2007 Share Posted October 3, 2007 I'll pick up some ZJ fronts and TJ fronts within the week... One of them might work. Those may be a bit heavy for your rear end as you don't have a motor on that axle, but maybe you're looking for stiff? Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 3, 2007 Author Share Posted October 3, 2007 The TJ coils should be lighterish, sorta. The ZJ coils used to be mine - they're rather heavy. I was going to run the math on their rate when I got them back. See where they sit. I think the TJs are only 170~, but IDK. The stock XJ fronts would probably have worked great. Too bad I gave away my set of those too. Too bad I don't have more space for crap. I could horde all my parts forever. Link to comment Share on other sites More sharing options...
jared Posted October 3, 2007 Share Posted October 3, 2007 jk 4 door stock coils rear - 5 full coils, then it has the small coil at the top which would make it six. the spring is 5/8'' thick and the totla length is 13 5/8'' long (this is laying on the ground) front - 8 coils, 1/2'' thick, and 17 1/2'' long. :cheers: Link to comment Share on other sites More sharing options...
feerocknok Posted October 3, 2007 Share Posted October 3, 2007 According to Superlift's website: The JK family uses 22 different factory coil springs, each with a slightly different rate, dictated by how the JK is equipped. They list that to explain why their coils could be +/- 3/8". Jared, how stiff do those coils feel? I've been curious, since I haven't ridden in a JK yet. Link to comment Share on other sites More sharing options...
jared Posted October 3, 2007 Share Posted October 3, 2007 the front coils looked like the rustys lift coils i put on my xj. i didn't really mess with them too much, but they came off a 4 door jk with a rear d44 and 4.10s. its a x model and it has a hitch. and its a soft top only model. Link to comment Share on other sites More sharing options...
86FUBAR Posted October 4, 2007 Share Posted October 4, 2007 why don't u just finger out the spring rate u need and then incorperate a 1" threaded rod in to the spring bucket for adjustment like they do in A$$CAR i mean NASCAR . :huh???: Link to comment Share on other sites More sharing options...
TNT Posted October 4, 2007 Share Posted October 4, 2007 The TJ coils should be lighterish, sorta. The ZJ coils used to be mine - they're rather heavy. I was going to run the math on their rate when I got them back. See where they sit. I think the TJs are only 170~, but IDK. The stock XJ fronts would probably have worked great. Too bad I gave away my set of those too. Too bad I don't have more space for crap. I could horde all my parts forever. Too bad you are so far away, I have 2 sets of stock XJ coils in storage and a set of front ZJ V-8 up country coils too Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 4, 2007 Author Share Posted October 4, 2007 I can get another set of XJ coils if I have too. I picked up the TJ fronts today. And buddy still had my ZJ fronts lying there - I can take them back if I need them. However, the TJ ones look liek they'll be really close. Dunno. Might have to play around with getting the actual weight on them to see. But I can do the math first. And I'd make my mounts adjustable, but that always comes out hack unless you have a lathe to cut threads (like the ACOS have). I do have access to a lathe, but I'm not into bothering. I'll just tack everthing on the first time and see. On another note, my truck sits way higher in the front. I'd better figure out how to link it too. Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 5, 2007 Author Share Posted October 5, 2007 Apparently the TJ fronts are 100lbs/inch. I think my calculator is flawed. Wait, re-did them... 115. That's not good either. Anybody have the measurements for a stock XJ front? Or know? I always thought they were 130ish... But IDK. I can steal some from the boneyard at some point... Link to comment Share on other sites More sharing options...
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