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Old 11-05-2018, 02:07 PM   #15
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Camas , WA
Join Date: Nov 2018
Posts: 2
Trans issues

I have a isuzu 6bd1 and am looking for what trans and parts needed to change from 4 speed to a alison 4 speed auto my email is dansboatworks

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Old 11-05-2018, 05:19 PM   #16
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1982 28' Airstream 280
Port Angeles , Washington
Join Date: Aug 2008
Posts: 1,714
Welcome to the asylum. We could use a little more info. The Isuzu has a SAE #1 bell housing mount so bolting up the Allison should be easy. The Airstream supplied Isuzu used a shop made adaptor ring to mount the GM TH400/475 trans. The Isuzu retained it's flywheel, ring gear and starter. The flywheel is setup for a clutch. Airstream mounted a "spud" to the flywheel and attached a GM flexplate to connect the torque converter. I'm not sure if Allison has a means to connect a torque converter to the flywheel or if you would need to change to an Allison flexplate or fabricate a shop made adapter like Airstream did for the GM trans. If you source an older Allison the installation will be mechanical, if you use a newer Allison you will need some electronic/computer controls to make the transmission work. You will also need to fabricate a trans mount and modify the driveshaft. I believe Airstream/Isuzu all had 4 wheel disc brakes and a trans mounted parking brake so you will need a parking brake on your Allison.

The above assumes you have an Airstream with a TH400/475 trans. You mention a 4 speed so you may have a totally different set up. If so ignore the above. Good luck.

Cheers, Dan

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