6066 (1960-1966) GMC Truck Club

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

- - automatic trans? (https://6066gmcclub.com/showthread.php?t=51744)

br-549

August 29th, 2024 03:42 AM

automatic trans?

Greetings from NC, We own a 1949 Flxible bus with a GMC 401. I am wanting to explore changing from a 4 speed un- syronized (spelling) to a modern automatic trans. Yes the length is an issue. What bolts up? What's the options? Thanks in advance.

Prowbar

August 29th, 2024 06:33 AM

Re: automatic trans?

Hello, could you post a picture of the engine and bellhouding that you have?
I'm assuming it is a SAE 2? (number dictates the size) Bellhousing. Which has round flange and equally spaced bolt pattern.

jbgroby

August 29th, 2024 11:31 AM

Re: automatic trans?

following

FetchMeAPepsi

August 29th, 2024 01:53 PM

Re: automatic trans?

Modern? Get a rope!

AZKen

August 29th, 2024 05:01 PM

Re: automatic trans?

There is a set of parts to adapt a GMC V6 to automatic but don't know if the will do a 401. Seems like may be flywheel and ballance issues.

Prowbar

August 29th, 2024 07:53 PM

Re: automatic trans?

Quote:

Originally Posted by AZKen (Post 78259)

There is a set of parts to adapt a GMC V6 to automatic but don't know if the will do a 401. Seems like may be flywheel and ballance issues.

Shouldn't have any balance issues. The 401 is internally balanced. The 379, 432 and 478 have external balance.

https://transmissionadapters.com/pro...9SVmdo6HDosfe_

This is the kit. It's expensive!

Funky61

August 30th, 2024 03:50 AM

Re: automatic trans?

Kool Link to TOMMR's

https://6066gmcclub.com/showthread.p...ight=motorhome

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