I need help buying a Cummins.

2004.5 & newer were all 325hp/600 ft/lb torque with 48RE trans. But that was the last year for filter mounted lift pumps. Carry a spare pump and spare filter. Read up on it. But I've heard of some problems with the in-tank pumps too. 2003 actually gets a little better fuel mileage. Service everything religiously.

Depending on what you're towing, watch the rear gears. Most can get by with 3.73 as opposed to 4.10.

I got my 2004.5 with 5,400 miles and has just under 170,000 now. Replaced the high pressure inj. pump , lift pump and water pump during that time. Changed the neutral safety switch recently because the column gear indicator wasn't registering correctly & had no back-up lights. Indicator fixed, but still no back-up lights. (Probably bad wire/connection somewhere.) Also had a small HP chip that went bad and was causing weird problems. Removed it and all was well.

Overall, I've been VERY happy with it.

Check Carfax, KBB, RacingJunk, etc. sites. But it could be good to find a "retired" owner who used it for RV'ing.

Good luck!