6066 (1960-1966) GMC Truck Club

6066 (1960-1966) GMC Truck Club (https://6066gmcclub.com/index.php)

- Transmissions and Rear Ends (https://6066gmcclub.com/forumdisplay.php?f=10)

- - transmission ID (https://6066gmcclub.com/showthread.php?t=51712)

bigred1

May 18th, 2024 03:12 PM

transmission ID

I have a 1963 gmc 1500 4 speed manual, where is the ID number for the transmission?

Funky61

May 18th, 2024 05:11 PM

Re: transmission ID

1 Attachment(s)

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

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