Cj784

I have an 84 CJ7 anyone have an idea of what gears I should put in.

Augie

What transmission, t-case and tire size do you have or intend on getting?

Cj784

I have a t-5 with 35 in muddin tires.my back gears are different from the front so 4 wheel sieve won't work. Hope changing both gears will help.

albatros_3

Motor? Horsepower will be a factor. I have a friend that has a 4.0L swapped in and runs 4.56. It runs just right for the highway and offroad. After he destroyed two T-5s though, he swapped in a NV 3550. I'm assuming you still have the stock Dana 300, so with 4.56s and that 2.72 4 low, you should have plenty of gear, unless you're doing some serious crawling. I think 4.88s would be too much and 4.10s not enough.

Cj784

It is a straight 6 4.0L it has a 5 speed that was put in

JKOperator

I agree with albatros_3, running 4.56 with 35's @ 65 MPH you should be around 2200-2300 RPM.