I have the 01 high output Cummins. Therefore, I have a 6 speed manual trans. I am told by our stock option reports that the new H.O. motor does in fact have the automatic now..I also have read on other (must own a Dodge or nothing nets) that they have finally did away with plastic hydraulic route hoses and a few other low end modifications and that finally the automatic can hold up to that high end torque.. I haul a Bri-Mar 18ft 12,000 lb trailer frequently. In fact last week I loaded a 14,000 lb fork lift and towed it two miles, very carefully too... Truck didn't know it was back there as far as pulling power.. Brakes did though.. I knew it when I was ready to go and took appropriate action because of this.. I've run many Ford P.S. and especially the new 6.0's.. My feeling is I don''t like the new 6.o's as Ford has pushed the software a little too far.. Ford had sued International Harvester for making bad motors. Sad thing is, the 6.0 is been running in school busses and small (18ft and under) straight trucks for almost 8 years now and not a single problem. Only the 6.0 in Fords are a problem and again, I feel it's because of pushing their software an hair too far and therefore pushing the motor way past safe limits. That being said, I still feel the Cummins is superior.. Don't take my word for it, look it up on the net and you will find out the Ford 6.0 and GM Duramax are considered light duty diesel engines. The Cummins is H.D. Mine is loud as I haven't the new forced fuel rail.. I don't know any better as a past owner operator with many a Cat 3406 model, the Cummins I feel right at home with. P.M. AndyMA on this net and ask him. He has a TN75 cab w/32LA loader and several heavy impliments that I move around here and there. His machine w/ impliments is nearing 9,000 or just over.. We are also living in a very hilly area.. They aren't high, they are very abrupt though.. Down one, up an 8% grade 1/2 mile and is pretty continuos like that. I know your hills are higher, but, they are much longer to climb also.. Our's are quick and abrupt.. I wouldn't be afraid to try the new H.O. with automatic. I highly doubt you will find a very late 03 or 04 that is used already unless it is someone ready to lose it to high payments.. BTW, I average 21 MPG besting once at 26.. Tomorrow Junkman and I will find out as we will go to New Jersey and back (9 hr turn) and see how it does. I ordered mine (custom ordered) in April of 01 getting it June 30th 01 and it has 35,000 miles on it. Oil. fuel filter and lube is done every 4500 miles and can go out to 7500.. I have the short bed, 6 1/2 ft club cab w/ the jump seat in rear and every single option available other than electric mirrors. I bought the high end tow pkg that comes with camper mirrors which I took off the first week. They are huge and stuck out way too far for me.. ( in fact 109 inches) I replaced them with regular mirrors as new electric were way up there. No warranty claims, no complaints.. Have the SLE model w/ all cloth interior, computer system in headliner and a 1200 tongue weight hitch system ( pintle hook not a ball set up).. I bought Bondo brand two part bed liner and did this myself. Same a Rhino brand spray in.. Awesome..