Good luck Russ...glad we could be of help.

Akry,
The electronic 5-speed will not retrofit into the W124's. It should be a do-able conversion for the W140's except that the electronics that are needed for the 5-speed are incompadible with your current engine management system. You'd be better off selling yours and buying a newer model for the cost of re-engineering. If you are going to put the C36 engine in anything I'd put it back in a W202 (C-class) or a 190E (W201). Have seen pics of a C36 motor in a 16v that made for a real midget musclecar.

Hope this helps...Lee