04-04-2022, 11:37 AM

1969GiPper 1969GiPper is offline

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Join Date: Apr 2006

Location: Saint Clair Shores, MI

Posts: 275

1969 THM400 Transmission Code PR

I have a 69 GP with a 428 H.O. 390 hp engine and matching Thm400 trans. The Yellow ID plate on the side of the trans reads PR -69-. I’ve read that in 1969 the PR code was exclusive to the GP with the 428 HO engine. I also read that the PR transmissions were equipped from the factory with extra large forward and intermediate drums for additional friction plates. Are there any other differences between the PR code and other Pontiac Thm400 transmissions? I’m planning to get this transmission rebuilt and want to know what if any special parts may be needed.

Last edited by 1969GiPper; 04-04-2022 at 11:43 AM. Reason: Typo

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