your jeep must be a dog ! that 5th gear mus be unused mostof the time ...

go for 4:10 !

easy to get ..cheap too!
youll love it !

 

I got 35" thornbirds on my yj and im running 4:88 gotta love the torque, does pretty good with highway speeds too

 

Here's a thought. The zj's are coil sprung at both ends so attachments should be usable on a tj. Many of the zj's have 3;73 gears and are also rear disk. There might be an issue with front driveshafts due to the short pinion on the tj's but not a big problem. I'll have to throw someone under a zj with a measuring tape.

 

you'd be better off by dropping a ford 8.8 find the right one and you'll get disk brakes&a 4:10 gear set

 

been looking locally with no luck. found s10 drive drive. Just need to find SM block.