I know that this swap has been covered fairly well over the years, but I cannot find a definitive answer to my question...

I recently found an 83 240GL in the local P&P junkyard and it has an M46. My 92 245 that it would be going into has the AW70. With the cable driven speedometer of the older M46, what will I need to do to make this work? I also read someone saying that they weren't sure if the older B230 bellhousing bolt patterns are the same as my newer one.

Anyone care to shed some light on this? I would hate to go through all the trouble of pulling all these parts out, only to find its a no-fit or a modding nightmare!

Thanks!

There are some issues to be resolved with your proposed swap--but not the ones you ask about. The bell housing bolt patterns are the same. Your speed will still be measured by the differential mounted sending unit (modify the cap part of the '84 cable to close the drive at the transmission). Your main issue will be -- how to drive the ignition system. You'll need to mount the electronic igniton pick-up onto the '84 bellhousing--relatively easy. You'll need to locate a standard shift flywheel to match your '92 ignition so the pick-up has something to read--maybe realtively harder. You should also be aware that your rpm relative to road speed in any gear will be higher than it would have been with a factory installation as the auto has a 3.7 rear axle while the factory stick shift has a 3.3. --- Dave

Thanks for your response, I thought there was more to it than what I had previously written.

As it turns out, I found and purchased a 1991 245 with an M47 in it. So I will use this as a donor car for all I need. The car is rusty and in need of much, so I don't feel bad about tearing it apart.

Now off to read all the info on the M47!!...