I have a 1999 Dodge RAM 1500 4x4, extended cab, 360 c.i engine.
I have what I think are problems with whining noise in the rear end, which was "confirmed" by dealer, which then did some "work", replaced bearings, ruined my ABS speed sensor, all to no avail. Noises continue as before, though my wallet is considerably lighter.
There is a ebay seller local to me who is offering a rear axle. It is from a '05 pickup, with 30k miles according to him, 3.92 gear ratio.