2010 E63 Squeak on hard accelaration Upshifts.
When I accelerate hard, a squeak occurs at the point of shift from 1st to 2nd and 2nd to 3rd.
It is NOT the tires. It sounds like a metal on metal squeak like something is loose at the rear, but I don't hear the squeak any other time even over rough roads, and it only occurs when the car is hot and under hard acceleration.
Also I only drive the car in M mode.
Wondering if anyone else has had this problem.
Thanks.






