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| | | Forums66 Topics128,087 Posts1,055,974 Members48,430 | | 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: Mar 2008 Posts: 127 Shop Shark | | Shop Shark Joined: Mar 2008 Posts: 127 | Can anyone tell me what model tranny I got? It has a casting number on the side that reads GM 376 930. I googled that and came up with nothing. I am looking for a complete gasket and seal kit.
Last edited by rautru; 10/10/2013 3:41 AM.
Glory Bound...
| | | | | Joined: Nov 2010 Posts: 1,159 Shop Shark | | Shop Shark Joined: Nov 2010 Posts: 1,159 | If you have a '57 6400,you should have a SM 420,if origional. | | | | | Joined: Mar 2008 Posts: 127 Shop Shark | | Shop Shark Joined: Mar 2008 Posts: 127 | I would say it's original. And I've been reading another post about a guy rebuilding his SM420. Thanks.
Glory Bound...
| | | | | Joined: Nov 2010 Posts: 1,159 Shop Shark | | Shop Shark Joined: Nov 2010 Posts: 1,159 | You betcha! Those tranny's are considered "bullet-proof",so if you re-build yours,it should serve you another 50 years! There's a link,too about an SM 420 rebuild in a "rock-crawler" Jeep application. Hope this helps. | | |
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