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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here.

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  #1  
Old August 29th, 2024, 03:42 AM
br-549 br-549 is offline
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Default 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.
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  #2  
Old August 29th, 2024, 06:33 AM
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Default 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.
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Old August 29th, 2024, 11:31 AM
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Default Re: automatic trans?

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Old August 29th, 2024, 01:53 PM
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Default Re: automatic trans?

Modern? Get a rope!

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  #5  
Old August 29th, 2024, 05:01 PM
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Default 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.
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Old August 29th, 2024, 07:53 PM
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Default Re: automatic trans?

Quote:
Originally Posted by AZKen View Post
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!
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Old August 30th, 2024, 03:50 AM
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Default Re: automatic trans?

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