OK, looks like things have changed/worsened..
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Anyway I went under the truck and looked for the loosened bolts and such.. nothing. I greased up the zerks on the U joints on the drive shafts but the one in the back wouldn't take grease for some reason. The zerk looked OK.. Well I climbed in the truck started it up and went very slowly up the driveway. Felt OK, then stopped on the incline and then went up some more.. with the slightly more strain on the rear end from starting on the incline I felt like a slip in gears of the rear end.. Bang bang then it went some more up and bang again.
So to test the new theory that there is some trouble in the rear end. I decided to put it in 4WD (bobbed remember) and flipped the air engaged switch over. With less pressure on the rear end with the front pulling as well the deuce went up the driveway just fine. I went around the block and on a sharp left turn in a cul de sak it made a small bang or two and was fine the rest of the way back.
I am thinking it is something in the rear end like a bad gear somewhere, or perhaps the un-greased rear drive shaft.. Anyone have any ideas on this? Again much appreciated!