Hello I am new to this site, however I recently bought a 1948 Chevrolet thrift master 3600 off of my dad. The body is in pretty good shape and it was running up until about 6 years ago when he took it to a mechanic to work on and the guy did not do anything with it for 6 years (gas lines are bad now as well shocking). When my dad took it to the guy the gas tank was having issues and was rusting out. I took it to a shop close to where I live about 3 months ago, where they have tried 3 different gas tanks and none of them have worked. They are assuming that the bed is a different year than the cab but cannot figure out what year the bed would be. Can anyone tell me if there is a way to figure out the year of the bed or if there is something else we should try doing?