I'm not aware of any Eaton Rear Axles being factory installed by Chevrolet prior to 1956 when they introduced the 9000 and 10000 Series (2-1/2 ton) trucks.

I'm also not aware of any shared parts between Corporate GM and Eaton Rears...maybe a bearing or seal?

Both GM and Eaton made Single and 2-Speed rears...

Mike B smile

Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD