Thanks! As always you are a great source of information on Dodge trucks! I'll just measure the u-bolts then and order 4 new ones and swap the axle assemblies out. A 2 wheel drive with open diff is pretty much useless around here and I like the extra strength the 9 1/4 will provide. Thought real hard about the drop in type of lockers for the 8 1/4, but since we get some pretty icy roads around here in the winter, that kinda put me off on that idea. I think I could handle it fine, but my just licensed son will be driving the truck once in awhile, and I can see the truck going sideways into traffic or a ditch quicker than he could handle as he is just used to front wheel drives