I'm still trundling along on the rear wheel bearings on my 1964 Newport. There's light at the end of the tunnel! I have new bearings pressed onto the axles and races in hand. However, when I slide in the driver's side axle it seems to drop in too far. The race/cup sits 0.075"-0.100" inboard of the axle tube flange, where the service manual says it's supposed to slightly protrude so I add shims. I've never been into the guts of an 8.75 before: is there some kind of plunger/shim at the thrust block that could have fallen out? It looked like there was a plunger on the passenger side; it was kind of hanging out of its hole and I had to poke it back into place with a long piece of plastic. I'm concerned that there was the same on the driver's side but it fell completely out and is now sitting in the bottom of my diff housing.