dieseldust, been running 65A cats since they came on to the market. Our first has 13,000 hours, last I heard after it went down the road, the other 65A we have now has 11,000 hours on it and niether machine has had any major drivetrain poblems. We have always changed oil in the bogies and the tranny and finals every 1 to 2 thounsand hours and had no problems. I would stick with a 65 in the older ones because it has the 3306 motor, which is bullitproof. It is also easily turned up to run at 350 hp with no problems. The one we have now with 11,000 hours has the original injectors and pump, and has only had the valves adjusted once. The tranny and finals on the original 65's are the same up to a 95e, which tells you how tough these machines were built. The thing I hate about them is the breaks, idiot who thought up that idea.