[JL8Jeff]

It sounds like you have several issues. The wrong rotors which you already identified, the bent axle flange, possibly a bad caliper and probably the wrong master cylinder for 4WDB. My old 68 Camaro had a bent axle flange which would cause the brake rotor/wheel to wobble. It was a non posi so it was easy to replace the axle. A lot of GM rear calipers are supposed to float and over time, all the dirt and moisture get in and they stop floating. It sounds like your left caliper needs a rebuild or replacement. My Silverado had bad rear calipers so I just got rebuilt ones from NAPA. I bet they can be rebuilt pretty easily, but if there is serious corrosion then it's probably better to get rebuilt ones. The bent axle flange can destroy the pads and probably warp the rotor pretty quickly so you should look into fixing that first.