When I bought my car, it had a rear positraction differential under it. When I drove it in high school it was very low geared, but was great for playing on the street. I had it under the car until I went to college and needed something better for highway driving. I ended up pulling the rear open differential from under my 4-dr parts car and using that since it had 3.08 gears in it. I placed my positraction differential next to my parts car and it stayed there most of the time until I started my restoration.
After finishing the engine and tranny, I decided to go through the rear positraction next. I brought it to my place from sitting out in the weather all those years for a good cleaning.
I ordered all new braking hardware, brake shoes, and rebuild the wheel cylinders since the casting numbers showed these to be the original cylinders. During the cleaning process, I found the stamp codes showing this rear differential was a 3.55 gear ratio Eaton positraction unit from the buffalo plant. (KF 05 11 B E - 3.55 May 11th Buffalo Eaton Positraction)
Differentail Page 2 / Back To Main Page