[Super Amjo]

My shifter shakes/vibrates pretty violently when in 3rd gear - the rest of the gears are fine but it's damn annoying because I can barely put my hand on in when accelerating in 3rd. I took it to the dealer and the shop manager said that this is normal and not any indication of any problems. My old 328 didn't do this but my new car is a 335 so I didn't know if this is common on 335s.

Problem is my warranty is up in 3500 miles and I don't want to have a problem after it expires -

Thoughts?