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Junkyard parts conversion is where it's at... Can be done for cheaper than new unit bearings.
I myself went ahead and bit the bullet on the full blown kit. Yes it isn't cheap but I will never lose my 4wd due to a vacuum hose or solenoid failure...and the next bearing replacement is going to be dirt cheap and much easier compared to new hubs.
But Quad 4x4 ( http://www.quad4x4.com/ ) is an alternative if you are going to stay with the OEM hubs.
Well, the heart of my Ram is about done. Zero compression on #2 today. Didn't check the rest but they can't be far off. Guess my schedule for the repower has been moved up on me now.