Dan, You're correct. I didn't realize he had a '46.
My muffler has a bracket built into the back of it that could be used for a strap type support. Or a modern tailpipe hanger could be used. Your diagram shows a hanger at the rear of the muffler with a bracket bolted to the crossmember gusset at the rear of the cab (if the 46 frame is similar to the AD series.)
