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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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Old May 18th, 2024, 03:12 PM
bigred1 bigred1 is offline
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Default transmission ID

I have a 1963 gmc 1500 4 speed manual, where is the ID number for the transmission?
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Old May 18th, 2024, 05:11 PM
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Default Re: transmission ID

Check Drivers-side upper area, under the grease.

Do you have any photos of it and where is reverse location on your shifter?

Quote:
How can you tell which 4-speed your 1966 has, if reverse is to the
driver & down, it's the SM-420, if to the passenger & down, it's the NP-435-GA

Jolly Page:

https://6066gmcguy.com/SM420.html
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Last edited by Funky61; May 18th, 2024 at 05:26 PM.
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