I heard of a local guy who put a small Cat motor in a GM 5/4 ex-military pickup. I dont know if it was a 3208 or 3216, I get the numbers mixed up. But they always put them in the 6500 series trucks, and the cabs are virtually identical. doors and fenders even fit. I also saw a new Volvo tractor that had a late 90s Chevy cc dually body sitting up on top of it. It was really cool looking, although probably about $80,000 worth of useless. Well, I don't know if it was useless, they pulled a real long race trailer with it, but a medium duty hotshot would have probably been better. I suppose having enough disposable money to crossbreed a 3500 Chevy with a Volvo semi tractor is cool in and of itself. If somebody didnt dare to build stuff like that, where would this country be?