Hi,
I have and 1980 olds custom cruiser with the 10/12 bolt. It looks like new gears are not an option. I have been trying to get a Ford 9-inch bult but can't find anyone with the specs for the build. I have some rough measurements, but I don't trust them enough for a build. Does anyone have oem specs? I attached a picture of what I have.
Thanks,

 

Have seen more than one, 8 1/2 inch corporate rear - with 3.23 posi, 11 inch rear drums, and a 5 x 5 bolt circle with 1/2 - 20 studs in many years of yarding. Never bought any - due to limited market and distance from buyers. Shame, because they were low rust, no scale southwestern units. Now - get one, or convert to one with bolt in axles, and theres your perfect GM rear end.

 

I have an 8.5" anti-spin out of a 1984 Custom Cruiser that I can bring to Carlisle if anyone is interested.

 

1990 -1996 Wagons will fit also. 30 spline axles,
Jim

 

Thank you everyone for the information.
I wish I was closer to Carlisle. What is the gear ratio? I think I am over 13 hours away.
Does anyone know who might be able to build a bolt in Ford 9 inch for this application?
Mark,

 

Currie, Moser, and Strange are the ones recalled. Unsure how active any of them are nowadays. Moser had 78-88 A / G body units ready to go, on the shelf, back in the day. Had one in a '78 Malibu project that used to own. Suspect B / C body offerings would have to be custom built, and pre-paid.

 

moser has a 9" option for 1971 - 1976 impala that should fit your wagon from 1980
Jim
JD Race

 

Not terribly helpful but all of the 77-96 B-Body wagons will fit under that chassis, 8.5 10 bolt, 30 spline. The sedans' spring perches are like, 2" narrower or so on the late model B Body relative to the wagons.

If you're looking for bolt-in axle shafts, 73-77 Cutlass rear ends will fit under the 77-96 chassis. I have an Impala SS axle under my '77.

Finally, yes, Quick Performance sells the B Body housing for $1,000 and the whole rear end for like $3k for "77-90" but will fit 77-96 B body.

 

Thank you guys that was good information. I was able to purchase 1971-1976 impala rear diff, everything worked great! Many hours of research and I never put that together. You have no idea how much that helped!

 

Good to here. What ends did you get?

 

Quick performance, 3.70 with true trac. Can't believe difference than the 2.56 gears. Feels like twice the pep and can actually use overdrive now.

 

Yep Overdrive is nice I have had it for 30+ years. I will not go back to 3 speed - You get both lowend and top end.