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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: Oct 2012 Posts: 3 New Guy | | New Guy Joined: Oct 2012 Posts: 3 | I've got a '39 Coupe with a '56 235 and have put '57 - '58 Chev gears into the '39 case and converted it to open driveshaft. I've just broken a tooth off and want to go to a Saginaw 4 speed because I can get a floor shift from Patricks for it. Will this fit without cutting the gearbox crossmember. I still have the master cylinder mounted to this. I'm looking for a '48 - '54 pickup bellhousing as we speak. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | 1937-39 pass transmissions are the shortest Chev transmissions I have ever seen. I Saginaw will be much longer.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | It will take some fabrication to make it work. | | | | | Joined: Feb 2004 Posts: 29,798 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,798 | The Saginaw case has the same bellhousing bolt pattern as the SM-420 and other late model transmissions such as the 55-up passenger car and truck 3-speed boxes. I'm pretty sure it won't bolt up to your bellhousing without some adapting.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Oct 2012 Posts: 3 New Guy | | New Guy Joined: Oct 2012 Posts: 3 | I'll use the '48 - '54 pickup bellhousing that I'm told will bolt to the motor, has the engine mounts at the front which I've got now and has the late gearbox bolt pattern. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | You are correct on all of those points, although 54 is not the last year you could use. 1948-59 should work.
A 1955-62 pass 235 bellhousing would also work if you are using key start.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Nov 2011 Posts: 37 'Bolter | | 'Bolter Joined: Nov 2011 Posts: 37 | My 47 3100 had the 216 with the 3 speed on the floor. I have a 54 235 that I wanted to use a Saginaw 4 speed with. The saginaw would not fit the narrow bellhousing that I had for the 216. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | kswillie,
If you use a 1948-53 truck bellhousing it will all bolt up.
See the USA in your vintage Chevrolet! My Blog | | |
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