When I bought my 50 3600 I noticed the passenger side of the cab sat about 2 inches lower than the drivers side. After crawling under with a flashlight I discovered the front cab mounts had rusted out and the previous owner had jammed lumber between the passenger side frame rail and the cab to keep it from sagging any farther.
Needless to say I ended up pulling the cab off and welding on new cab mounts. Now it sits even.
