I replaced wheel bearings all the way around but the rear end swap was a pumpkin swap from a 1972 3/4 ton pick-up with automatic transmission. It gave me a 20% speed increase. This is covered pretty well in the one ton forum. That project was only 1/2 days work and the results were immediate and pretty dramatic. I now can cruise at 50-55 and pass at 60 if I need to (can't wait for someone slow enough that I can pass)! Overall this makes my truck pretty balanced between the power (302 with Stromberg 2 bbl), braking (one ton disc conversion in front) and handling ( rebuilt knee action shocks), and safety (55 mph). I can live with the gear whine but hoped there might be something else that makes it more enjoyable to use.