If it was known before the body build started that a required major component (like an axle) wasn't going to be on hand in time for the chassis build, the body wouldn't be built until the component availability was confirmed. If the body was already in process and a major component shortage became known (records screwup, transportation failure, etc.), the finished body could be held in the Chevrolet body bank until the component was available. Or, worst case (and rare), the order could be changed to a different ratio or Posi/Non-Posi that WAS available, and the unit would be built that way; this didn't happen very often, as it required a lot of specs work to manually re-create the order so it would generate the correct Broadcast codes when the unit was released from the body bank. Dealers and customers also didn't react well to arbitrary order changes at the plant.