I was surprised to find that both the owner's manual and the shop manual don't give lug nut torque. I finally found the torque value in the 47-54 assembly manual. For all 4000, 5000, and 6000 series trucks, torque to 250-275 ft-lbs.
Curt ---- 1953 Chevy 6400, 1957 Chevy 2dr Sedan --"Mediocrity is easy, the good things take time"