Agree with the comments regarding kingpins. I have found it helpful to remove weight from the kingpins while greasing them. Do this by jacking up the truck and supporting it from the frame or axle so the kingpins are not supporting the weight of the truck.
Oldbolter
1959 Apache 3800 dually flat bed/dump with 261
1956 3800 dually flat bed/dump with 235
1957 3600 flat bed, 350 engine, 700R4, PS, disc brakes, 14 bolt rear with 4.11 gears
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