my friend and i are in a debate about whether or not the allison was an option or in 100% of all duramax's in 2003/2004. He thinks they were optional and i was under the impression that they ALL came with allisons. can someone please help clear this issue up?
/jk lulz. yes they didn't have the allison. but like I said the relevance of duramax vans to this forum or the average citizen is very low. no offense Stepchild.
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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