I own a 2001 GMC Dually with a 8.1 and allison tranny it is a great truck, I pulled a 38 hustler from jersey to st louis thru the mountains in Pennsylavnia, no problem at all. and is by far a lot more comfortable than the Fords.

thanks for the input. Exactly what I needed, sounds like th e general concensus is 8.1L or diesel.

JUST ONCE, I work for one of the largest Chevy/GMC dealers in the mid atlantic . Give me a if you need any help with the purchase, i can deliver or ship you one. I have helped many on this board. Brett Dean 410-463-1822

THANKS GUYS, Brett I'll let you know