allison optional?? - Page 2 - Chevy and GMC Duramax Diesel Forum
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post #11 of 15 (permalink) Old 11-13-2012, 09:55 PM
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Was the Allison also standard in the 01 Dmax's?
A buddy was trying to tell me that there 01 dmax work truck has a 4-speed auto only.


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post #12 of 15 (permalink) Old 11-13-2012, 09:56 PM
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Originally Posted by Boreen View Post
Was the Allison also standard in the 01 Dmax's?
A buddy was trying to tell me that there 01 dmax work truck has a 4-speed auto only.
your buddy is wrong.

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post #13 of 15 (permalink) Old 01-17-2013, 09:54 AM Thread Starter
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So did any 2001s or 2004 come with a 6speed or only 5???

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post #14 of 15 (permalink) Old 01-17-2013, 10:23 AM
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as mentioned above, the 6-speed allison wasn't available til the 06's.

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post #15 of 15 (permalink) Old 01-17-2013, 10:52 AM
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2001-2005 are 5 speed autos.
2006-now are 6 speed autos.

There was a 6 speed manual option being te ZF-6.

Vans are a little different with 4L80's and I think the new ones are different...

Bottom line if it is a Duramax (6.6) auto trans, then it CAME with an ALLISON transmission... You can swap in other stuff (why??) but they came with Allison's, no other auto was featured in the TRUCKS.

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