question on gears

jeepn217

New member
I have a 91 wrangler with 2.5L and 5 speed transmission. I was wondering if anyone knows what gears are in the differentials. Thanks
 

im not 100% sure but i believe you have 4.10s.. you can jack up the back of you jeep. make a reference mark on your driveshaft.. rotate the wheels and watch the driveshafts as it turns. a little ovedr 4 would be 4.10s. three and a half would be 3.55s a little over 3 would be 3.07s
 

i thought they onlyused 307s on the i6 motors with a manual transmission? my xj had a 4 liter and 307s with a 5spd. when i put it on 35s i lost 5th and could barely use 4th. then i swicthed out to 4.56s. worked good. but im considering going to 513s now.. im upgrading to 37s
 
In my observations the 2.5 came with either the 4:10 or the 3:54 ratios. That 3:07 IIRC was only used in the I6 w/auto trans. But what do I know? It's a Jeep.
 

Standard gears

3.07's are only avaiable with the 4.0 and the 5 spd. the auto got 3.54.

Bounty is correct on the the 4 cyl

Some 4.0 5 spds did get 3.54 gears if they were equip with the light duty tow package.
 
Oh excuse my ignerts, I'm a CJ man forgot where I was.
I have an '84 CJ w/2.5 manual. It had 3:54's. Had an '85 w/2.5 manual it had 3:54's. But then I have an '80 CJ7 w/auto and it's running on OEM 3:07's same as my '82 CJ8 auto, wish neither had the highway gears but it's what came inum. Thats good enough. Maybe I'm just too OLD to post up a reply.
 
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