Hello,
i should have posted a picture of my motor mount as well.
yes richard the pinion was loose when i picked up the car and looked for the noise. should have checked more frequently. i did 8 batteries yesterday only checking the motor position as i was aware there is a issue with this. motor didn't move the whole day but as you can see the center diff was forced into the motor mount. i think combined with the moving pinion and the hard impact that caused the damage on the spur.
anyway i had a lot of fun with the car learned to check the pinion as well and now its time to find a suitable setup for this track.