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Longhorn Man · 09-29-2008, 08:51 PM

3.54 was the standard gear on all big block 3/4 tons, 3 speed, 4 speed, or auto. It was not even avalible on one tons.
Dooley, do you have a spid showing your 3.73 gear? Or was that simply what you found in yours? Now granted, yours is a GMC, and there is little to no documentation on them, but chevy doesn't show 3/73 anywhere for any 3/4 or one ton trucks at all in the 67 - 72years.
dfosh, can you show a pic of your diff? If it's a dana, it should be a 60 (assuming 2 wheel drive here) and I've only heard of one 3.54 that was not in a big block truck... claimed to be original (a respected member, the ONLY reason I believe it is true)

09-29-2008, 08:51 PM	#14
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 1972 GMC 3/4 ton rear axle ???? 3.54 was the standard gear on all big block 3/4 tons, 3 speed, 4 speed, or auto. It was not even avalible on one tons. Dooley, do you have a spid showing your 3.73 gear? Or was that simply what you found in yours? Now granted, yours is a GMC, and there is little to no documentation on them, but chevy doesn't show 3/73 anywhere for any 3/4 or one ton trucks at all in the 67 - 72years. dfosh, can you show a pic of your diff? If it's a dana, it should be a 60 (assuming 2 wheel drive here) and I've only heard of one 3.54 that was not in a big block truck... claimed to be original (a respected member, the ONLY reason I believe it is true)