Ok back to the truck for a minute (if it is still an option). I had an 03 Dodge Dakota with the 4.7 and the 5spd manual. It was an amazing drivetrain combo. Got great fuel mileage, had plenty of power, and was reliable. Just to clarify though, the transmission IS a NV3500 and it does NOT have a true granny first. Dodge never put the NV4500 behind the 4.7L. Getting the boat out of the water on a steep ramp at the lake was an exercise in clutch slipping. Once moving in 1st my Dakota had no problems towing 5k worth of tractor and trailer around when needed. Make sure to always let the motor warm up fully before getting on it hard as it has iron block/aluminum heads. I am also glad to hear it has the 3.90 gears in it. These will help you out and if you don't put too large of a tire on there you should have enough power to keep you satisfied. My truck had 3.55's and still did alright. As others have said, watch your weights and keep up on maintenance. The Ram 1500 from these years is actually a good strong truck and the cabs are solid with very few rattles in the long run. The T-case should be a NV241HD if I remember correctly. I am assuming it is shift on the floor since it has the manual trans. Remember that 4.7 likes to rev so when climbing hills just downshift and let it spin. I was able to get 19mpg consistently out of my 2wd Dakota so that should give you some indication of what a larger 4wd truck should achieve.