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Old 04-07-2016, 02:05 PM   #1
1972K20
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Allison/Cummins Combo-Defuel

As some of you know, I have been collecting parts for a Cummins build. One issue I wasn't settled on was the transmission. Well, it looks like I will be going with an Allison that was behind a 2008 Chevy 2500 Duramax.

Here's my question: Is there a way for a 6bt to be setup to defuel with the Allison? it's my understanding that this is necessary for the Allison to prolong it's life. Are there other options without defuel between shifts?
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Old 04-07-2016, 03:16 PM   #2
Dieselwrencher
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Re: Allison/Cummins Combo-Defuel

If you use the GM TCM some one will have to tune it via EFI live and then they will set the parameters and defuel would be one of them. I have a friend doing one in a 94 F350 with a 12v. He won't have any feed back for a while though as he's pretty much doing a frame off resto.
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1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
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1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed
1972 C10 Suburban Custom Deluxe
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Old 04-10-2016, 11:40 PM   #3
1972K20
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Re: Allison/Cummins Combo-Defuel

Are you saying that defuel would be disabled via the tune?
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Old 04-11-2016, 08:45 PM   #4
Dieselwrencher
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Re: Allison/Cummins Combo-Defuel

Quote:
Originally Posted by 1972K20 View Post
Are you saying that defuel would be disabled via the tune?
NO, but they might be able to turn it off, I doubt it though. I know the defuel/delayed shifting is a lot of the reason why under 10sec Dmax trucks ditch the Allison.
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Ryan
1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1972 GMC Sierra Grande Longhorn 4x4
1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed
1972 C10 Suburban Custom Deluxe
1969 Chevy milk truck
1971 Camaro RS 5.3 BTR STG3 Cam Super T10
1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project


Tired of spark plugs? Check this out.
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Old 04-12-2016, 09:23 AM   #5
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Re: Allison/Cummins Combo-Defuel

Ok, thanks
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