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Bob Don · 01-04-2021, 08:32 PM

I had a 2002 2500HD 2wd with Allison tranny and 8.1 vortec. I got right around 10mpg towing about 8K #s. The tranny temp would go up a little going up hills but nothing too bad. When conditions allowed, I ran around 75 mph with the trailer with no issues.

01-04-2021, 08:32 PM	#8
Bob Don VIP Member Join Date: Oct 2002 Location: Greater Boston Posts: 1,495 Likes: 1,113 Liked 900 Times in 191 Posts	Re: Chevrolet 8.1 Vortec advice I had a 2002 2500HD 2wd with Allison tranny and 8.1 vortec. I got right around 10mpg towing about 8K #s. The tranny temp would go up a little going up hills but nothing too bad. When conditions allowed, I ran around 75 mph with the trailer with no issues. __________________ Bob Don 128 SS