[ilvracn]

my race car team had a couple suburbans we used to pull the trailer with. first one was a 1979 350 gas, no a/c. we upgraded to an 85 with a 6.2 with ac. the gas truck was better for pulling. the 6.2 just didn't have any power. tried to run a/c, cooled for a while, but the floorboards would get so hot it about burnt your feet. also took a lot of power45 mph uphill. ran better after races, with the cool air. the 6.5 diesels are hard to set pump timing, have to use gm scanner, diesel shops in my area don't want to work on them. they tell you to go to gm dealer.
not sure you can find anyone old enough at dealership that knows anything about a 1990's diesel engine. i am a gm guy but i would stay away from a gm diesel, unless you get the 6.6 isuzu duramax.