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Yes both differentials have to be re-geared otherwise you'll have problems. Are you going to keep the Gov-Lock (Detroit locker by the way)?

Have you called to see if they just have some? 3:73 or 4:10 gears would even be common in GM vehicles over there. However if they don't have access you can try: Randy's Ring & Pinion. The Differential Experts. Auto Parts & Services. Ring and Pinion Gears - Summit Racing Equipment National...

Well I never heard him say how well the truck accelerates as opposed to stock. However it's simple math. With a 35" tire your turning more mass and therefore putting a larger load on the drivetrain. Most people put a lift kit and big tires on these trucks and just expect them to perform without...

If you switch to 35" tires you need to change your gear ratio. A lot of guys say no but my opinion is that those guys will typically drive the truck a little while and sell it. The current gears in your axles, with 35" tires, would put strain on your transmission. I put a lift with 35" tires on...