If I might add, in '76 at least, for B-body GM, try to get a rear out of a car with larger than a 350 engine. I bought a posi out of a '76 Olds 88 350 engine car and it has a physically smaller looking center section with the vent on the center section instead on the axle tube like the ones that came out of 400 and 455 cars.
I have a '75 Riviera 2.93 posi rear in stock here. Never realized they were different than other B body's. Is it location of the mounts?
By the way, I'm using a rear out of some big old Buick in my '73 B-body Pontiac now. It is super tough - I put a couple hundred thousand miles on it, had different shift kits over the years that hammered the U-Joint rollers into the trusses, broke the CV joint pieces, and now a 455 that hammered rollers into trusses again so I went to Lakewood joints to cure that, but that rear end (knock on wood) has never given me one bit of trouble. It's a 2.56 posi.
That's another thing to keep in mind. By '76, most of those B-body cars had either 2.56 or 2.41 gears (for 400 and 455 engines, respectively). C body '76 buicks had 2.56 even with 455's though. If you want deeper gears, look in '71 cars - they had a little bit deeper gears then. Maybe 2.73, 2.93, 3.08. We had a '71 Cat 350-2bbl car that had 3.23 posi in it. My '73 had 400-2bbl and 2.93 posi originally, but I've seen some of them with 2.56.
Someone once told me that the Olds 98 rear was alot different, and from the above post I can see why. It was suggested that it was unusual enough to be harder to get parts for. If they're easy enough to get, though, and they are really that tough, then why not, I guess.
Mike
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