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Mod | | | Forums66 Topics128,050 Posts1,055,761 Members48,426 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | Joined: Apr 2005 Posts: 2,097 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,097 | A friend installed a 700R4 transmission in a 1964 GMC short bed 1/2 ton pickup in his shop. He gave me the 3 speed that was removed from the truck. I'm trying to figure out what it is. It is not a SM318 unit but what seems to be a more heavy duty 3 speed. It is a short, top loader (6 bolts) with a rear flange that bolts to the output shaft like an SM420 and used a driveshaft with a slip joint. It has a casting number on the side of the case C-94981.
I did some research on a GMC site and it lists a Warner T89B
and a New Process 746G as options.
None of the pictures of the Warner look anything like this thing and was unable to find anything on the New Process.
I would appreciate any information on this unit.
Fred
Last edited by rfs56trk; 05/19/2017 10:51 PM.
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
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