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| Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here. |
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#1
October 16th, 2025, 05:25 PM
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Trans ID and Date
I have a 63 gmc and after some initial research it appears that when the small block chevy was swapped in they also swapped in an sm465 and maybe a different rear end.
For the transmission, see the attached pic. Want to confirm this is an sm465 and would like to figure out how to nail down the manufacture date. Stamp ID: 465452 9312 I believe the 465452 points to a sm465. The date code 9312 might refer to 9 month but then 31 wouldnt be the day of the month because september doesnt have 31 days. Finally the 2 might be 72? 82? Thanks for any help. 
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#2
October 19th, 2025, 01:22 PM
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Re: Trans ID and Date
if reverse is left and down, it's a 420. If it's right and down, it's 465.
__________________
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#3
October 19th, 2025, 03:45 PM
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Re: Trans ID and Date
Yeah it's right and down, was one of the things that clued me in to it not being a 420 once I started researching it and realizing it wasn't just the engine that had been swapped.
Was hoping to get some info on decoding the stamp on a 465, I have yet to find those specifics when searching on the web.
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#4
October 20th, 2025, 12:02 AM
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Re: Trans ID and Date
Quote:
__________________
Ed Snyder Medford, Oregon 1962 1000 Pickup 401M & Muncie 318 with overdrive 1962 K1000 Suburban 401M & SM420 1967 CM1500 pickup 351E & NP435
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#5
October 20th, 2025, 01:44 AM
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Re: Trans ID and Date
From what I found the casting numbers on case are GM 465452, 6273212 or 3901127 to indicate the SM465.
Also top shift cover should read GM390113. From a Muncie transmission website I found I interpreted the 9312 as; 9=1969, 3-3rd month MARCH, 12 is 12th day Just my read on those 4 numbers and how other transmissions were broken down on that website. There is nothing specific on the 465 there. https://www.dmetransmissions.com/casecodes
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1961 GMC Suburban 305A Overdrive 1962 GMC Utility 305D
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