The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1971 C-20 Questions

Longhorn Man · 10-26-2009, 05:00 PM

forgot to mention the 400 engine.
If you are going by the badges on the fenders, then that 400 would have actually beeb a 402 big block, they never installed the 400 small block in these trucks. If it was a 402, then the only automatic it would have had was the TH400. This would include the Dana 60 rear end with the 3.54 rear gear also, and that's the best gear that came in the 3/4 ton trucks, although, the axle shafts aren't all that strong in them.

10-26-2009, 05:00 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: 1971 C-20 Questions forgot to mention the 400 engine. If you are going by the badges on the fenders, then that 400 would have actually beeb a 402 big block, they never installed the 400 small block in these trucks. If it was a 402, then the only automatic it would have had was the TH400. This would include the Dana 60 rear end with the 3.54 rear gear also, and that's the best gear that came in the 3/4 ton trucks, although, the axle shafts aren't all that strong in them.