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Transmission identification
Posted by: momach ()
Date: May 15, 2019 07:25PM

Having an excess of transmissions, I got to looking over a few of them.
I'm at a loss to ID this one in yellow.
Both of these have the small filler and a drain plug.
So, likely 1961, right?
But, now what about the different casting on the bottom? No provision for a welsh plug.
Any guesses?

Steve , on the wet side of Washington State

one too many cars,(maybe)

1962 Buick Skylark
1964 Monza Spyder Coupe
1965 Corsa vintage race
1966 Corsa
1967 Datsun 2000 roadster

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Re: Transmission identification
Posted by: Phil Dally ()
Date: May 15, 2019 07:29PM

Not sure if this helps...from the Junkyard Primer.

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Re: Transmission identification
Posted by: Frank DuVal ()
Date: May 15, 2019 08:16PM

Both have back up lamp switches? Yellow one is hard to see.

Frank DuVal

Fredericksburg, VA

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Re: Transmission identification
Posted by: momach ()
Date: May 15, 2019 08:17PM

casting part number (yellow one) GM4 3782078


other transmission is GM3 3798364

Steve , on the wet side of Washington State

one too many cars,(maybe)

1962 Buick Skylark
1964 Monza Spyder Coupe
1965 Corsa vintage race
1966 Corsa
1967 Datsun 2000 roadster

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Re: Transmission identification
Posted by: RexJohnson ()
Date: May 15, 2019 09:09PM

The yellow one is a '61. In '61 the reverse detent was a piece of heavy sheet metal, holding the spring loaded plunger that bolted into the large flat area on the bottom of the case with 3 bolts. In '62 they went to the welch plug and also made some changes to the clutch gear and the front of the mainshaft. The'65 shop manual in the 4sp section has a picture showing this detent assy. The picture is of some other component but you can see the detent as they were using pictures already on file.

RJ tools
Salem,Oregon

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Re: Transmission identification
Posted by: momach ()
Date: May 16, 2019 05:28AM

Thanks Rex, 1961 it is.

Steve , on the wet side of Washington State

one too many cars,(maybe)

1962 Buick Skylark
1964 Monza Spyder Coupe
1965 Corsa vintage race
1966 Corsa
1967 Datsun 2000 roadster

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Re: Transmission identification
Posted by: vairchet ()
Date: May 16, 2019 10:42AM

Yellow transmission is a '61 w/bolt-in reverse inhibitor. Blue transmission is a '62 to '63 example. Both are passenger car 4-speeds.

Chet in Ramona

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