What year? The pre 04.5 trucks (lb7) ATE injectors. Somewhere in 06 they are said to have fixed the "pump rub" issue, but time will tell. All have issues with leaking tranny cooler lines (Allison to radiator to cooler to Allison). I am at 133k on my 07 classic, other then the cooler lines, rear transfer case seal (twice), and rear driveshaft ujoints the first 100k have been trouble free. Sence then it has been a turbo, front left wheel bearing, and alternator (it has been an expensive year). The AC seems to have a slow leak, I have to have it charged every year now.