stock rear end

does anyone out there know the specs of the 1991 caprice 305 rear end??

if not does anyone know if any caprices came with a posi rear?

thanks guys

yes posi was always available, and 7.5" is the civvy axle and 8.5" with trailer package and with 9C1, both 4 3/4 and 5" patterns came on 8.5" axle

IIRC, Any wagon is going to have at a minimum an 8.5" ring gear and up to an 8.75" . Also, all wagons 77-96 would have a 5x5" bolt circle.

fastr68, Were you a regular at GMF? Name seems familiar....

IIRC, Any wagon is going to have at a minimum an 8.5" ring gear and up to an 8.75" . Also, all wagons 77-96 would have a 5x5" bolt circle.

fastr68, Were you a regular at GMF? Name seems familiar....


CD i am fast68 from there yes, what happened to GMF ? one day i went there and it was poof gone

what gives ?

and what is 8.75" rear ?

gm made 8.5" 10 bolt

8.75" was 12 bolt

other 10 bolts were 7.5 and 8.2

7.5 is commonly under B-body cars, is what is under most all of them 77-up except trailer package or 9C1, etc.