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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: Apr 2005 Posts: 2,098 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,098 | Measure the length of the transmission and count the number of bolts on the side cover. I owned an un-modified 66 C-20 that I purchased from the original owner. It came with a 292 I-6 and the short housing Muncie 3 speed. That transmission is approximately 15" long has a non syncro first gear and has a 4 bolt side cover. It is likely the GMC used the same transmission. However, if the other transmission has a 7 bolt side cover and is about 22" long it is likely a Saganaw. You would have to modify your driveshaft to use it.
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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