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Discussion Starter #1
I have 12 JKU with 3 1/2 inch lift and 37/13.50's. The Jeep was built to cruise the strip at the beach, so wheel travel was not an issue.

Recently I installed a Rampage rear bumper, and just a few days ago a GOBI Stealth rack. Its now rubbing the rear bumper anytime I go over what would basically be a little less then a curb. I went down the road to a shop that messes around with big trucks, etc, and was told I could simply switch out the springs to a 5.5" and that would raise it up a couple of inches and we're back in business. That seemed odd me in concept as lift was designed to be a 3 1/2, therefore I would think all the arms were built for that amount. Raising it up would make things too short? I called the manufacture of the lift and they told me the same thing (just get larger springs), though they added I would need some sort of steering extender (I don't recall the technical name). I was ready to order until I was informed they are out of stock on all these items and it would be about 3 weeks. At this point I decided I would just cut bumper, however for the heck of it I drove down to 4 Wheel parts today and was told the exact opposite to the above. They said my original thinking was correct. You cant take a 3 1/2 lift and just add 2 inches to it. I would need new shocks etc. That makes more sense to me, but I am very uneducated when it comes to all this. 4 Wheel said the thing to do it add a 1 3/4 Rear Coil Spacer, so I ordered it, and its set to be installed on Tuesday.

I still feel like I might be missing something in regard to not having 100% accurate information. Seems like 4 Wheel should know what they're doing, but it also seems like the manufacture of the lift should fall into that same category. So who is correct?
 

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http://www.jkowners.com/forum/modified-jk-tech-dept/83895-lift-height-measurements.html post 14
What is your measured lift?
2.5" with flat fenders gave me room for 37's until I added 750 pounds of co-worker and both our work gear. 3.5" metalcloak springs fixed it, coil spacers worked for a while also.
Thing is, my 37" trxus tires rubbed the front of the rear wheel well behind the rear doors. Yours rubs the rear bumper?
5.5 inches of lift is a huge lift, your steering geometry will suffer, pinion angles, roll centers, swaybar links, brake lines abs lines, ride, stability would not be great. More so with a roof rack and any load on it....so the 1st shop is not the best source of info.
 

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Not sure why 4wheel would tell you that you can't just add longer springs and then in the next breath they tell you to order a coil spacer kit. Going above 3.5 inches of lift is likely going to require extensive amounts of work to the rest of your suspension system. It doesn't matter if you get new longer springs or add spacers to your existing springs, the net result is still a lift of approximately 5.5" total which is a HUGE lift by jeep standards and requires other parts to make it work correctly. Additionally, it sounds like you only ordered rear spacers? That's gonna make the jeep sit funny with a very pronounced forward rake.

A true 3.5" lift is plenty for 37s. I would rather cut my bumper than lift the jeep any further.
 

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Random Dude
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For all the right reasons, FUCK a tall lift. :flipoff:

CUT THE BUMPER

or

change rear BUMP STOP length to keep the tires out of the bumper
(& add springs or spacers as needed)

and / or

CUT THE BUMPER

If the new bumper is getting into the tires, I'd fix that first.

Also, everything coilrod and boopiejones typed is dead-on.

For all the right reasons, FUCK a tall lift. :flipoff:
 

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Discussion Starter #5
Its seems like too many opposing opinions on this to do it correctly. Cutting the bumper takes them all out of play. Thanks for the replies.
 

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I am still not seeing how you hit the rear bumper during flex.
 
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