Brian, For a definitive answer, I would call Patrick Dykes of Patrick's Antique Cars and Trucks. He sells the gear sets so I am sure he would know of any differences between Chevy and GMC....520 836 1117

Bill M
53 GMC Hydra-Matic

Home Page
http://home.comcast.net/~bd97/index.html

When you argue with a fool, two fools are arguing..