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Re-Gearing With Larger Tires

2K views 17 replies 5 participants last post by  mel_the_medic 
#1 ·
I have an 06 LJ Rubicon. I just did a 2.5" SL and am currently running 30.5" tires on 16's. Would it be safe to say I could upgrade to 32" or 33" tires without having to worry about re-gearing my ring and pinions? That's a pretty $$$$ job and I'm just trying to avoid that right now. Tires are not my speciality at all. So I'm here cause y'all usually know what's up!
 
#5 · (Edited)
The correct ratio and how well it will run on those 33's depends a lot on which transmission you have. 6-sp or automatic?

Guessing you have the automatic, it will lug severely in Overdrive with 33's and the optimal ratio for that combination is 4.88. Yes, 4.88... which will give you optimal highway RPMs.
 
#14 ·
4.88 is what you want for 33's, 5.13 for 35's with the 4-sp automatic. The reason for ratios that may sound too low is your 4-sp automatic's .69 Overdrive ratio that drops the RPMs too low for big tires. If 35's are definitely in your future I'd go with 5.13 now. 4.88 is not quite enough gear for 35's which is my current frustrating combination.
 
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