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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: Sep 2005 Posts: 50 'Bolter | | 'Bolter Joined: Sep 2005 Posts: 50 | I have a 57 gmc w/347 Pontiac, has original 3 speed, want to buy a 4 speed, anyone know if anything (4 speed) will bolt up to the stock bellhousing ?
Need trans & shifter too !
thanks | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Any small index GM 4 speed (exept for the late '60s Pontiac "Dearborn" 4 speed) will work fine. The SM420, which was the factory option on the '57 GMC is a direct bolt in, no additional linkage required.
Bill Burmeister
| | | | | Joined: Jun 2009 Posts: 2,201 Shop Shark | | Shop Shark Joined: Jun 2009 Posts: 2,201 | Cool Truck Jeff! Longbox already answered your question but I just had to give you a couple  I like the Pontiac striping on the rear fenders. | | | | | Joined: Sep 2005 Posts: 50 'Bolter | | 'Bolter Joined: Sep 2005 Posts: 50 | Thanks, now if I can find one !!! | | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Normally I wouldn't reccomend a T5 with a v8, but your 347 is only good for about 205 HP. A t5 would give you OD, as would an A833. The A833 will require some machining of the bearing retainer to fit the bellhousing. For what it's worth, I have a NV4500 behind my 1959 Pontiac 389, bored and stroked to 447, in my 1959 gmc 1/2 ton.
Transmission reccomendations are hard to do without knowing how you plan to use your truck. | | |
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