I know nothing about the Ram 1500 but I do know you can buy 1500's with higher payloads than some 2500's. I wouldn't consider buying a 2500 for anything. Think either 1/2 ton or 1 ton srw. The 1/2 tons I have riden in have a far superior ride to a 2500/3500. The gearing of your 1996 truck should have absolutely nothing to do with selecting the rear axle ratio for a new truck. The proper gearing is determined by considering the power band of the engine your choosing; the gear ratios in the transmission; the type of use the truck will see and the weight of the trailer. Look at the towing guide of the truck you're buying and select the lowest numerical ratio recomended by the engineers for your application.