I have a posi unit for a 7.5" gm rearend, typically found in 78-87 G-body cars, S-10's, Astro vans, and 3rd generation camaros. It requires 3.08 or numerically lower stock gears. Also have two richmond gear sets, 3.23, and 4.56. Both of these gears will require a carrier with 3.08 or numerically lower. Note: Picture is not my actual unit, due to the fact that mine is still in the housing. $100 for the posi unit. $75 each on gear sets.



That is the post that I am looking to buy. I have a 1994 S-10 blazer 4.3L CPI TH700r4 4X4 tahoe package 4 door. please someone help.

 

What gears do you have in your diff?

 

umm just a small correction, i have the same truck as you and i dont have the 700r4 its a 460le. and in response to swartlkk if its the same as mine he probably has 3.42 THEY SUCK!! bill to see what it is look on the paper on the bottom of your glove box G80 means you have a posi and GU6 means you have the lovely 3.42s i really cant help you with your question but if you dont want the 4.56s ill gladly take them lol