Originally Posted by pwjeep

I understand that there is a secondary pump in the transmission that will allow you to push or pull start W123 or W126 vehicles. If a car is towed with the rear wheels on the ground the transmission secondary pump will start to rotate the transmission and then engine. If you are going to tow one of these cars be prepared to also buy a transmission. The only safe way to tow one of these vehicles with the rear wheels on the ground is to remove the rear drive shaft from the differential flex disk and tie up the drive shaft. I tow-dolly'd a W126 from Northern Texas to the Detroit metro area this way.

I understand that later W126 models did not have the rear transmission pump and that you could not pull / push start the car with the automatic trans

So either remove the axle from the rear flex disk or flat bed it!