Here is my opinion. I owned two 97 Chevy 6.5's, one 2500 & the other a 3500. Both were bought new with 4x4, Auto's. Great trucks owned both till around the 200,000 mark. Both had injector pumps replaced around the 120,000 mile mark. 2500 tranny made it to 140,000 and the 3500 to 190,000 miles...