rear end

i want to change my rear end real soon...i have a 94 caprice with a 5.7L 350 and the rear end is a 7.5 inch with 2.73s....im thinking about switching to the 8.5 rear but i cannot decide what gears i want to put in... at the most i will go with 3.42s but what kind of rpms will i be looking at on the highway cruisin at 80 or so....lowest i would go is 3.08s....is there any gears i can put in either rear end between 3.08 and 3.42..should i definetly get an 8.5 inch rear or can the 7.5 handle 3.42s?? any help or suggestions are appreciated

An 8.5" 3.08 w/rear disc brakes out of a '94-'96 9C1 is a bolt-in replacement, provided you get the driveshaft that goes with the donor car.

My '88 is running a '94 9C1 rear axle set. Works grrreeeeaaaaatttt!

Wouldn't a 94 already have an 8.5" rear? Especially if he has a LT1? And he'd should have 3.08s too with an LT1.

How have you verified your 7.5" and 2.73s?

car came with an 4.3L 265 L99 and i had a 350 put in it about a year ago....where can i find a 8.5 rear?

car came with an 4.3L 265 L99 and i had a 350 put in it about a year ago....where can i find a 8.5 rear?

Well, that explains the 2.73 gears. Anyways, junkyards, etc. I picked mine up for $130 complete.

CD, the civilian LT1 cars typically come with 2.93 gears, but I do think you're right in that it should be an 8.5".

Anyways, junkyards, etc. I picked mine up for $130 complete.

I gotta come down to AZ sometime and get a truckload of parts. Cheap, rust-free stuff.