323i Shifter Vibration in 1st
So I recently noticed that under heavy acceleration in 1st gear, there is a very audible and noticeable vibration being emitting from the shifter. The shifter has been replaced with an aftermarket unit (no rubber isolator a la OEM).
Any hard/heavy acceleration in 1st gear. Symptom does not appear in any other gear or on deceleration. The vibration also seems to only come through the shifter and not the body or any other components.
The car has seen some heavy use in track circumstances and has roughly 270 000 km on the engine and transmission and drive line components.
2 X engine mounts (with M3 mounts)
2 x trans mounts (with M3 mounts)
Rear Subframe reinforcement kit
Poly subframe bushings
My 1st impression is it could be a tired bearing or gear inside the tranmission causing 1st gear to misbehave, however that has been no other issues with other gears or any problems wit the car jumping out of gear/grinding.
Could it possibly come down to the driveshaft "guibo" or rubber disc gone bad ? Any insight here is appreciated.