Some GMCs of that era had Spicer rear ends. I put one under my '56 Chevy. I used Chevy cylinders and shoes with the Spicer drums and have had no problems.

If the third member doesn't un-bolt from the front, it is a Spicer.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.