[swedishsteel]

Originally Posted by DavidG

If your pickup is truly a pickup (i.e. it rides on a 112" wheelbase commercial vehicle chassis and not on a big truck chassis), there was no distinction in the engine number serialization prefix of '36 engines destined for passenger cars and commercial vehicles. In other words, if your pickup is a left-hand-drive version produced in the U.S. it will carry the same 18 prefix for its engine number as the car in front or in back of it on the assembly line.

To solve the mystery of the identity of the transmission case, you need to clean the back of it below the machined vertical machined surface to find its cast-in part number. If it has a 48-prefix part number, it is original for a '36 passenger car and commercial vehicle. If it has a different prefix, then it is not original and someone has changed the number on the top of the transmission bell housing (which is not unheard of).

Thanks for the info