So I have my jeep lifted 6.5 in. but found out that my diff gears are not combined. Im trying to buy upgraded gearing to 4.11 or 4.56. My tires 33x12.5 thinking of going bigger. I dont know if its 30 35 40 44. and i dont know how to find out I know my rear axle is original but my front axle is from a later model, I have an 88. I would greatly appreciate the help. Thanks

 

You probably have either a d35 or c.8.25

 

if you are going with 33 tires I would do at the least 4.56 gears. I'm upgrading to 33's and might even go 35'5 and going to run 4.88's. Gearing is importand so do some research.
if you have a D35 rear. you dont want to put more stress on it than it already has. It"s just my opinion.

 

Front

 

rear

 

i currently have 33's with 4:56's and i love them you can tell a huge difference

 

you have d30 up front (not that bad if you build it up) and d35 rear aka turd!

 

so my combo is gonna be d30 4.56 front. and d35 4.56 rear.... why do they callit the turd

 

do gear the rear. buy a real axle, 8.25,d44,8.8. the turd of a rear axle has weak tubes, small diameter shafts, tubes that spin, ring and pinion that are small. its great axle for stock 28,29" tires but they cant handle much more the that IF you actually wheel it.

the d35 are the #1 axle that comes into the shop needing repairs

 

Thats a good suggestion but im from Puerto Rico and its a bit hard to axles and gearing here. So if i had to stay with what i have can it last a bit till i upgrade

 

oh well you just need to be resourceful and learn to fab up stuff