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Jul 21st, 2025 | | | | Joined: Oct 2013 Posts: 32 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2013 Posts: 32 | My Truck has a column shift so I'm guessing its a Saginaw 3-speed. I've looked through the search on this forum, Google and even called around to some transmission shops. The stamping or even the bolt patterns did not meet the ID criteria. I So here are some pics hope you guys can help me out. Oh, and I'm rebuilding it in school that's why its all apart. My Instructor believes its a Saginaw. I just want to verify for sure. Stamping on the housing
The housing itself The cover and levers Extension housing Stamping on extension housing
"Start living your dream now no matter what the sacrifice, and everything else will fall into place."
| | | | | Joined: Apr 2005 Posts: 2,066 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,066 | What you have is commonly referred to as an SM318. While they were supposedly built at the Saganaw and Muncie facilities they are generally referred to as a Muncie. Anaheim Gear which is the source I purchase parts from here lists them in their parts book as a Muncie. The later full syncro 3 speed (7 bolt side cover) is commonly referred to as a Saganaw.
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
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Fred is spot on. Easy transmission to overhaul, once you find the parts. If all you need are the gaskets and seals, Napa can get them.
Bill Burmeister
| | | | | Joined: Jul 2013 Posts: 863 Shop Shark | | Shop Shark Joined: Jul 2013 Posts: 863 | Fred is spot on! This is what was referred to as an old Muncie 3 speed. Easy to rebuild and almost bullet proof. These are tough trannys. If you need more parts than just gaskets check drivetrain.com. They have all the hard parts for the SM318. Just look under Chevrolet/GMC trucks 1967 and older. Hope this helps.
Last edited by fixit1958; 10/01/2014 6:21 PM.
"Pay attention to the details! It ALWAYS pays off."
1949 Chevrolet 3100 Series 1/2 ton Pickup
1964 Chevrolet C10 (Ol' Yella) (SOLD)
1958 Chevrolet Biscayne 2 door (SOLD)
1970 VW Beetle
| | | | | Joined: Oct 2013 Posts: 32 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2013 Posts: 32 | Thanks a lot guys this really helped. I found the kit with the bearings and gaskets and seals. I'm actually using my transmission as apart of my "lab work" in school. I'm attending an automotive technology program at a community college so I can kill 2 birds with one stone. Thanks for the help!!!
"Start living your dream now no matter what the sacrifice, and everything else will fall into place."
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