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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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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: Nov 2011 Posts: 141 'Bolter | | 'Bolter Joined: Nov 2011 Posts: 141 | Is there a resourse for transmission casting numbers.
Mine says 3813389 any suggestions?
Thanks
Trombones Totem Poles And Old Trucks!
| | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | Try googling the number. I did and came up with this-
Early SM420--Cast#591907,837334,591926,591593
Late SM420--Cast#3761930,3813389,3837334
| | | | | Joined: Nov 2011 Posts: 141 'Bolter | | 'Bolter Joined: Nov 2011 Posts: 141 | Thanks Cletis. Do you know about this transmission? Is it sycronized? Is this something I could put in my 46GMC?
Trombones Totem Poles And Old Trucks!
| | | | | Joined: Nov 2011 Posts: 141 'Bolter | | 'Bolter Joined: Nov 2011 Posts: 141 | Well I answered my first question by google. It is synchronized!! But can I put it with my 248? Should I I have it in the shop right now with the tranny dropped out. Man I think I would like to put this transmission in my truck. It would be a heck of a lot easier to drive right???
Trombones Totem Poles And Old Trucks!
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