Tire Advice

HPD2000

New member
I am looking to buy a 2006 TJ Rubicon. It currently has 315/75/16 tires and a 4.5" lift. It tachs 2800-2900 rpms at 60 mph with a 4.11 rear differential. What size tire does this Jeep need to bring it into an acceptable rpm range?
 

I'm not up on Rubicons - is 4.11 the factory gearing, or did you regear it?

Manual or automatic?

I've got a 2005 TJ - 3.73, automatic, and 33x12.5 tires. It is fine, but I don't think I could go any larger without regearing.
 
Using Jeepergeo links, which are good, you should have favorable low RPM at highway speeds with 35" tires on 4:11 gears. And those numbers seem correct.

What range rpm are you desiring?

I'll have to run some basic calculations to verify


Regards,
JPNinPA

Sent using TapTalk
 

So if you have an automatic in 3rd at 2850 rpm you would be doing 72mph if I calculated correctly. You might not have a corrected speedo /odometer from factory. So 31" tires will have you at 65mph at 2850rpm in 3rd gear.

Alternative is regearing to 4:56 or 4:88
Regards,
JPNinPA

Sent using TapTalk
 
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