I believe the Allison 6 speed is reserved specifically for chevy and gmc trucks and is only mated with duramax engines. The gas isuzus are the only ones that share chevy power train components. The diesels I believe are all Isuzu with aisin transmissions I believe. The 6 speed in the gas NPR is the same mated to the 6.0 in 2500 and 3500 hd trucks. Chevy calls it their 6l90e. It seems to be a very strong transmission in our 2011.
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