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Old 01-10-2012, 09:26 AM
Thread Starter
Join Date: Dec 2011
Posts: 2
what size tires and wheel?

Hey everyone,
I'm new to this so, please have patience. I have a 2010 4 dr Red Rock wrangler and I have the dealer putting a 4 inch lift on it (it won't void my warranty). It came with 18 inch wheels however, I'm afraid it will look silly if I don't put on new wheels and wider tires. Also, I'm a little worried even though it's too late about how it will handle on turns (maybe I should have done the 2.5 inch). This is my daily driver so, I want it ride well too. Let me know what you think. The reality is that I'm borderline mechanically retarded so speak slowly. Thanks to all.

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Old 01-10-2012, 09:49 AM   #2
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Location: Burlington, NC
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You can keep your stock wheels if you want, but with a lift that large, anything under a 35" tire just isn't going to look right in my opinion. In order to run something like a 35x12.5 on those stock 18s, you would need a set of wheels spacers. And the tires would be insanely expensive.

So I say sell the stock 18s, and pick up some 17s, or hell even some 15s, with the correct backsace (something in the 3.75"-4.5" range). That will save you a bundle on tires right there.

However, if you do go with 35s, get ready for a massive hit to your performance. Since you have 18" wheels, I'm assuming you have a Sahara, so the best gear ratio you can have is 3.73, and worst you could have is 3.21. With the 3.73s, you might be able to live with the 35s for a while, but it would be a dog on the highway and would be searching for gear all the time. So a regear will probably be in order. If you have 3.21s, a rear gear would be a must, especially with an auto (not sure which you have).

Another thing with the 35s, is the possible need of reinforcing your axle with sleeves and gussets.

Then you will need a programmer or tuner so you can "tell" the Jeep that it has a larger than stock diameter tire on it and what the gear ratio is (if you change gears). This will correct your speedometer and shift points accordingly. A tuner, like the Superchips, will also allow you to select different performance tunes which may help a little with performance. A programmer, like the ProCal, will just allow you to change the tire size, gear ratio, etc, but does not do any tuning.

Then with the 4" of lift, you will need to keep an eye on your driveshaft and in particular the front driveshaft boot. It will likely catch on the tranny pan and tear, leading to driveshaft failure. Even if it doesn't tear the boot, the extreme angle that the driveshafts will be in is something they were not designed for, so you will need to look into driveshafts, front first followed by rear.

Which lift is your dealer installing? Does it have adjustable control arms to correct your caster/camber or does it use cam bolts (God forbid!)? Adjustable trackbars? Drop pitman arm?

I would also take the dealers word about the warranty not being affected with a grain of salt.

All in all, it sounds like you should have done MUCH more homework before deciding on a lift. Not sure what kind of offroading you do, if any, but I believe you would have been plenty satisfied with a 2.5" lift and 33s and saved a bunch of headaches. Getting into lifts this size and large diameter tires get VERY expensive if done right/safely.

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Old 01-10-2012, 02:10 PM
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Join Date: Dec 2011
Posts: 2
Wow; thank you very much for the info. I think I may be better off eating the re-stocking fee on the 4 inch lift and going with the 2.5 inch. Again, I appreciate the help. I may have to change my user name to; More money than brains.
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