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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jun 2010 Posts: 298 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 298 | Is there a difference between the 1954 gmc and the 1954 Chevy trans
I have a gmc and have a good Chevy trans. Can I put trans. In truck? | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | One difference would be the flywheels.
Another difference that would most likely not matter: carburetors.
Cletis, we need you (he had both transmissions).
Maybe Greg Hill knows? | | | | | Joined: Jun 2010 Posts: 298 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 298 | What difference is the flywheel? | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | I think there is a difference in the flywheel mounting-bolt pattern (and, number of bolts) on a 1953 GMC H-M, compared to the later Chevrolet H-M flywheel.
If that is correct, I would guess the later GMC H-M's bolt-pattern (and, number of bolts) would also be different. | | | | | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | The fluid coupling (no, it's not a torque converter) from the Chevy will probably interchange with the GMC transmission. If it's in good shape, that will probably solve the fitment problem when the GMC trans is bolted to the Chevy engine. Be aware that the runout between the bellhousing and the crankshaft centerline is extremely critical when the hydramatic is mated to the engine, so much so that Chevy matched engines and bellhousings at the factory on H-M equipped vehicles.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jun 2010 Posts: 298 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 298 | Can I put a Chevy trans. To replace the gmc trans? | | |
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