Good question: on my '04 GMC it had an option for the Duramax (instead of the standard gas engine) which came with a 4L80e, or a "package" option for the Duramax w/Allison. The funny thing was that the Duramax/Allison was the same price as the Duramax/4L80e. So to answer your question, if the origional buyer was an idiot, he/she could get the Duramax without the Allison.
Posts by kewlly
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Well, it was on the GMC web site. I played with the options as I "built" a truck online and it allowed the Duramax/4L80e option, but caught others like trying to order rear seat DVD without subwoofer/leather bucket seats, etc. Obviously, I wasn't going to get anything but the Duramax/Allison anyway. I can't say (or does it really matter) if GM did build it, but if not, why was it allowed on their site? Besides, it's a moot point anyway if you look at the tranny pan for the magic word "Allison" 
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