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Old 11-29-2011, 12:18 AM   #1
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JK Lift Question

Hello all,

I have a 2007 4-door JK with the stock suspension. I plan to put a 4" lift on it but have a few question before I do it. I have custom built lifts for CJs, Land Rovers, and Ford trucks in the past, so I can fabricate parts if needed.

1) Some kits have just the basics for the lift (springs, caster adjustment, adjustable front track bar, sway bar links, and rear track bar bracket). The caster adjustments that come with these kits seem useless. Is that true? If I don't use the caster kit, what do I need for caster (if I need to adjust it)? If I need longer control arms which ones (front, rear, upper, lower?)? How much longer do they need to be?

2) I have some 4" SuperLift springs from I friend who upgraded to a 6" lift. I also have his front adjustable track bar (Rough Country). How good are these springs? How well do they do on the road and off-road? If these springs are really not that great, what lifts are folks running that work well on and off road?

3) My '79 CJ has 35" tires and 4:10 gears. I plan to run 35" MT tires on the JK. I am presuming I will need to regear the front and rear, but how much do I need? How well can the Driveline handle bigger tires (what is going to break when I wheel?)?

4) Do I need a drop pitman arm for a 4" lift? Other than longer brake lines, track bar(s) and quick disconnects, what else do I need (steering damper bracket, bump stops, etc..) that might not be in the lift kits?

Thanks!

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Old 11-29-2011, 12:25 AM   #2
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4" is a lot for a jk if on 35s....if im right a jk only needs 2.5" of lift to fit 35s comfortably...re gearing is up to you, it will obviously be slower with 35s but it depends on your current gearing, motor, and trans...I cant help on a lot of the stuff because i have a tj but someone will come along with more help ;] with 35s you will want to look in to a better rear axle if you have a d35, beefier brakes and steering as well..and steering stabilizer wouldnt hurt, youll deff need bumpstops too

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Old 11-29-2011, 01:26 AM   #3
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4 inch lift u can fit 40s with flat fenders ... I have a 4" and currently saving for 37s.... Depending in if u have a 2door or 4 door def need adjustable control arms some make it without replacing front driveshaft on te 4 doors. And 2 doors needs front and rear drivehafts. Heard super lift is kinda shitty but that's what iv heard.... Pretty sure they make some of the mopar stuff though...... Your rear axel should be fine and if u sleeve and gusset your front and rear I think I'd be fine for 35s.... I'd try to use superchip before re gearing some people are fine with that
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Old 11-29-2011, 01:28 AM   #4
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Teraflex. Rock krawler.... Bds. Check out those brands
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Old 11-29-2011, 09:38 PM   #5
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Quote:
Originally Posted by Jeepin_68
Hello all,

I have a 2007 4-door JK with the stock suspension. I plan to put a 4" lift on it but have a few question before I do it. I have custom built lifts for CJs, Land Rovers, and Ford trucks in the past, so I can fabricate parts if needed.

1) Some kits have just the basics for the lift (springs, caster adjustment, adjustable front track bar, sway bar links, and rear track bar bracket). The caster adjustments that come with these kits seem useless. Is that true? If I don't use the caster kit, what do I need for caster (if I need to adjust it)? If I need longer control arms which ones (front, rear, upper, lower?)? How much longer do they need to be?

2) I have some 4" SuperLift springs from I friend who upgraded to a 6" lift. I also have his front adjustable track bar (Rough Country). How good are these springs? How well do they do on the road and off-road? If these springs are really not that great, what lifts are folks running that work well on and off road?

3) My '79 CJ has 35" tires and 4:10 gears. I plan to run 35" MT tires on the JK. I am presuming I will need to regear the front and rear, but how much do I need? How well can the Driveline handle bigger tires (what is going to break when I wheel?)?

4) Do I need a drop pitman arm for a 4" lift? Other than longer brake lines, track bar(s) and quick disconnects, what else do I need (steering damper bracket, bump stops, etc..) that might not be in the lift kits?

Thanks!
After much thought on lifts and review of the threads here are my thoughts .
There are several very helpful venders like Jason from rock krawler that can assist you with questions on several lifts. Just pm or email him
1) caster adjust : lower control arms front upper control arms rear. Length of arms not sure
2)for review of super lift coils I'd read super lift reviews on wrangler forum lift review but most suspension lifts come with coils so if your doing complete kit shouldn't have any problems
3) regearing for sure depends on wheel weight choices and tires 5:88 ? MT are fairly heavy compared to say Duratracs are you adding bumpers winch even more weight? Driveline some guys get away without change but with 4 " lift and hardcore flexing most guys say anything above 3" lift your taking a chance.
4 ) bump stops for sure. steering stabilizer for bump steer ,maybe hope that helps get you started but like I said lots of helpful far more experienced folks on this forum. Can give you specifics. :-)
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