Rear gear decisions..

[N2TRUX]

Originally Posted by RandyS8229

Hey guys, I've got an 85 c10 350/th350. I am in the process of a 90s 4" spindle lift. I've decided to go with 33s. My truck came with 2.73 in the rear. I just finished rebuilding my th350 and it's time to regear. I'm torn between 3.73 and 4.10 or 4.11 or whatever it is for 12 bolt. Anybody run a similar set up and want to share opinions? I only drive 50+ very rarely and for short amounts of time. Like 30 40 min on the interstate to orlando

Has the rear end been changed? Your 85 didnt come with a 12 bolt, it should be a 10 bolt. Regardless of what axle you have, you cant go from a 2.73 to a 4.10 gear unless you change carriers too. I believe your 2.73 is running a 3 series carrier which will only accommodate up to a 3.73 gear. To go any lower you will need a 4 series carrier.

With that said, I think 4.10s would be a better choice if your running 33's and a TH350.