I am trying to help my son install a power function m motor in his Technic extreme cruiser. We found a good place to put the motor and if we hold it in place it does drive the rear wheels.
The problem we are having is figuring out how to secure the motor to the car so that it stays in place when we operate it via the remote control. The power function accessories have mostly traditional Lego style connectors but the Technic has none of those style bricks.