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
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Jolly Page:
https://6066gmcguy.com/SM420.html
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1961 GMC Suburban 305A Overdrive
1962 GMC Utility 305D
Last edited by Funky61; May 18th, 2024 at 05:26 PM.
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