I dont understand why everyone always says that the best way to tell a WD from a WD45 is the straight shifter! In a world where we didn't have people that try to make an extra buck at their fellow humans expense this might work. That world doesn't exist so the only way to properly tell is the tractor and the engine serial numbers, period! I bought a WD that had the shifter changed and WD45 decals added to try to pass it off as something it wasn't. This happens with muscle cars all the time. So to all of you who are new to the wonderful world of Allis Chalmers, do your homework! check the numbers!