I can't blame some of you for being Cat biased. They have made great engines over the years. Their mid range series are well built & run well. But, if you look at the market share, you will see the Cummins outsells that market by a long shot. I think that says something. Getting into the heavy duty engine, class 8 truck series, we can get more power out of the '95 and up electronic Cat's till the '03 emissions engine came out. Now they have problems. I talked to a guy yesterday that has 240K on his and he has had 5 manifolds and 6 turbos replaced all damaged by exhaust heat. I wonder what the pistons look like by now? There are more but I won't get into that here.
As far as the older, non computerized, heavy duty class 8 truck engines go, I'll take a Cummins. I have many 400's out there running well over 1000HP and have been out there like that for years. Ok, I'll get off my soap box now. It's the old Mopar, Ford, GM debate of the diesel market.
Larry, does this thing have a turbo or a blower? It seems real odd GM would use the competitions product. What year is it? If it's older they would have owned Detroit back then and I could see them sticking a V8 Detroit in there. I guess the stickers say it all though. Get the model number and let us know what it is. Hopefully it's an Allison trans. They are bullet proof
Do your homework too. If it's a 3208 I don't know what parts availability is like. I haven't worked on one of those for years. I do know the old Cummins V engines are almost impossible to get parts for and when you do get them you pay a big buck. I'm looking forward to seeing the pics!