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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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: Mar 2006 Posts: 13 Junior Member | | Junior Member Joined: Mar 2006 Posts: 13 | i have a trans and on the side ,driver side is some # can someone tell me how to decode them on 1st line is #1, 2nd line G M, 3rd line 590474.
panelman
| | | | | Joined: Dec 2004 Posts: 452 Member | | Member Joined: Dec 2004 Posts: 452 | 590474 is a casting number for the case of an early crash box 4-speed (non-synchro, w/ reverse lock-out). These were used from '31 to '47 in the bigger trucks. This particular number is most likely from a later one, near the end of the run.
Curt
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1953 Chevy 6400, 1957 Chevy 2dr Sedan
--"Mediocrity is easy, the good things take time"
| | | | | Joined: Mar 2006 Posts: 13 Junior Member | | Junior Member Joined: Mar 2006 Posts: 13 | thanks for the info this isgoing to be in my 1st serers panel truck 1947 like a 46. trying to keep everything orig.
panelman
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