I have a 1993 2wd reg cab long bed D-100 (1/2 ton) with 318 and O/D automatic. The rear end on this truck has a really low gear for towing from the factory and I want to change this for a more fuel friendly highway speed setup. the rear end I have is totally factory stuff, never been altered at all. I do not want to mess with changing out ring and pinion, but would rather pick up a used complete axle and bolt it in. Is there a rear end, 1st, 2nd, 3rd gen ram or chrysler car etc that would bolt right up to the springs, slide right on to the driveshaft and have 3.80-3.90 or so factory gearset? I need to know what years of trucks or other cars that I should hunt for in the wrecking yards etc to find what I need. thanks a bunch!