maxbraketorque
NAXJA Forum User
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- PDX
All the ring and pinion ratio vs tire size charts for the XJ simply adjust the R&P ratio to offset the increased tire size on a 1:1 ratio. So if I were running a 31" tire which is about 10% large diameter than stock by the numbers on the tires, then I would change from a 3.55:1 to a 3.90:1 R&P. And for 33" tires, it would be 4.10:1. However, I've now seen plenty of posts where people with 33" tires are running 4.56 and 4.88:1 R&P ratios. Since the TC has a 4LO option, I don't understand the point of substantially undergearing. Does rock crawling or navigating over very difficult terrain benefit from doing this even with an auto trans?