Glad to see you're getting it out and working on it again Kenny! Sorry about your MIL...tell Diane I'll be thinking about her.
On the axle...take a good look at the machined surface the bearing is pressed onto. It must be worn and letting the axle/bearing slip in and out...IF the bearing itself is still in good shape.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax