Well the rear differential in my jeep decided to shit the bed on me the other day and it looks like we are gona throw some new new gears in it. I talked to a friend who has a good knowledge of mechanics and he says I should go with 3.50 or a 3.55 gear ratio. The jeep is a 97 with a 4.0 and 5 speed Hurst shifter. Ive got 33's on a 15 inch rim and was wondering if you guys could help me pick out the proper set of gears for this set up.
Ok, how is the gas millage going to be like with those? My jeep is my daily driver and it only goes off roading occasionally. I just need something that is going to be reliable but still has potential for light off roading.
I ran 4.56's on 33's for a few years. I would not recommend going any numerically higher with your ratio than that. 4.10's would probably be perfect, but if there is even a chance of bumping up to 35's later then 4.56 is a good choice.
BTW you say you have a 1997 4.0...chances are you already have 3.55 gearing. 97 was the only year that was offered and I think most 97 Wrangler "sports" came with that gearing. Check the tag on the diff cover and see what it says...there will be 3 numbers
I don't know about most 97 Sports, but mine came factory with 3.07's. I put 33's on it in 2002 and it was a dog. I swapped in a Dana 44 w/ 3.73's and it was much better. I later regeared to 4.56 and it was just a tad too much gearing. I am now on 35's and the 4.56 gears seem to be the best fit for power and fuel economy-much better than it was on 33's with the same gears.