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| | | Forums66 Topics128,162 Posts1,056,944 Members48,458 | | 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!
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| | | | Joined: Feb 2013 Posts: 2 New Guy | | New Guy Joined: Feb 2013 Posts: 2 | I would like to change the entire rear axle on my 51 3100 and keep the original 4 speed. My ? is what or how to seal the rear opening on the trans when changing to an open drivshaft??? I changed (will be) the engine to a 73 250 and kept the sm 420 4 speed it had in the truck originally.
thanks, BILL | | | | | Joined: Nov 2004 Posts: 338 'Bolter | | 'Bolter Joined: Nov 2004 Posts: 338 | Just find an open driveline SM420 and use it as is or steal the retainer off of it. | | | | | Joined: Aug 2004 Posts: 1,418 ODSS Lawman | | ODSS Lawman Joined: Aug 2004 Posts: 1,418 | You have two options. You can tear your SM420 apart and change the rear housing for an open dirveline setup or swap the whole transmission.
SWEET Sergeant At Arms: Old Dominion Stovebolt Society BUNS?!?!?!Where we're going, we don't need no buns.....1950 GMC 450 1951 Chevy 1/2-TonThe GreenMachineIn the Stovebolt Gallery | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Sweet is making it sound harder than it is.
You only need to change the yoke and rear housing. This can be easily done with the transmission in the truck.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Aug 2004 Posts: 1,418 ODSS Lawman | | ODSS Lawman Joined: Aug 2004 Posts: 1,418 | Learn something new everyday. Thanks Dave!
SWEET Sergeant At Arms: Old Dominion Stovebolt Society BUNS?!?!?!Where we're going, we don't need no buns.....1950 GMC 450 1951 Chevy 1/2-TonThe GreenMachineIn the Stovebolt Gallery | | |
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