If you switch the rear to a 8.5 with 3.73's then you will have to change the front gears to 3.73's also. You would be better off though changing the gears in the 8.5 to 4.10's. The bigger the tire you run is like running a smaller gear.im in the process of lifting my s10 i have a 2003 ext cab 4x4 4.3 that im putting 33"s on i curently have 4.10 gears with 7.5 rear and want to switch out to 3.73 in an 8.5 is this a smart choice
You may want to check again. I dont know of any older s10's or blazers coming with the 8.5's until 98-99ish. Most of the ones that did come with the 8.5's were ZR2's or 5 speed trucks.Wow, this thread delivers! Thanks to everyone who has contributed. I've been repairing gearboxes in machinery for years and finally decided to break down and do my rear, and I realised I know nothing about them (until I read this thread).
I always knew I had an 8.5" rear (OEM in my '93 2WD 4.3), but never knew what gears I had. Now I know it's a 3.08. All I have to do now is save up a little bit of $$ and jump in.