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Click on image for the lowdown. 
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11 members (GMCJammer51, Steveoreno, 4tttt8, Jay R, Joe H, dt235sd, Peggy M, 55shaker, FAST55, 1955 1 Series, Waveski),
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Global Mod,
Mod | | | Forums66 Topics128,180 Posts1,057,164 Members48,465 | | 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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Apr 2005 Posts: 2,102 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,102 | The original 3 speed transmission is about 22" from the bellhousing mounting surface to the end of the tail shaft.
The SM420 is about 14". As mentioned previously the front yoke and u-joints are completely different.
A modified or replacement driveshaft will be required.
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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