Originally Posted by AdrenalineJunky45
i want to regear to 4.56's, what all do i need to do this?? im a bit new to jeeps but so far ive done most of the work myself. any information would be very helpful. i know i need the gear and pinion set and maybe the overhaul kit, someone said something about a new carrier but im unaware of what that is exactly???
If you're getting a new set of gears the overhaul kit should not be a maybe. It should be a must. You'll already have everything out of the axles anyway, you might as well put new bearings on it. A good master install kit will have everything you need: shims in abundance and even two crush collars in case it doesn't get crushed quite right the first time.
For the D30 the case break is 3.54 and down / 3.73 and up.
For the M35 the case break is 3.31 and down / 3.55 and up.
So if you have 3.07 gears now you will need a new carrier front and back to go numerically higher than 3.73.
If you have 3.55 now you would need a new carrier for the front, but not the rear if going numerically higher than 3.73.
If you have 3.73 now, you don't need new carriers.