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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
| | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | The New Process is a 4 speed. The BW T89 is not a top loader. What you describe sounds like a BW T86 out of a Jeep. | | | | | Joined: Apr 2005 Posts: 2,097 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,097 | Thanks, I got the info that I posted from 6066 GMC Guy on the net.
It has the standard GM trans to bellhousiing bolt patterm.
I have looked at numerous pictures of 3 speed transmissions and nothing snows up.
Fred
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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