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  #1  
Old July 26th, 2021, 03:03 AM
br-549 br-549 is offline
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Join Date: Jul 2016
Location: W Jefferson NC
Truck: 1949 Flxible bus with a 401 v6
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Default Automatic behind a 401BB?

Hello Gents. I have a 1949 Flxible bus with a GMC 401. It currently has an un- scronigized transmission that jumps out of first and reverse. I'm thinking that since i need to remove the trans anyway i should explore my other trans options. With manual steering and this trans, driving this bus is a chore. I'd like to explore my my options both manual and automatic. Remember this is a BUS... suggestions? Thanks in advance!
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  #2  
Old August 7th, 2021, 07:58 PM
BobBray BobBray is offline
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Truck: 1967 CM 2500
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Default Re: Automatic behind a 401BB?

Probably your best bet would be an adapter kit and a built Turbo 400. Only other choice would be to find an old Allison transmission and bell housing. I assume your Flxible is a Clipper with a 'straight-in' drivetrain. Clippers are not too heavy, a professionally built Turbo 400 ought to work. Just install a big cooler. Here is a source for an adapter. Don't get sticker-shock!:

https://transmissionadapters.com/collections/gmc
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  #3  
Old August 8th, 2021, 06:03 PM
WE7X WE7X is offline
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Truck: 1970 GMC RM-7500 based Motorhome
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Default Re: Automatic behind a 401BB?

BR-549
I have an Allison (MT-1?, I will have to check the model), SAE bell housing, and shift control console, which came with a 478M in a 7500 series truck. I no longer own a GMC V-6 powered vehicle, so this is excess to my needs.
Rod Johnson

Last edited by WE7X; August 8th, 2021 at 06:06 PM. Reason: Wrong name(edit)
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