Hi
My car has zero vibrations in 1st and 2nd gear to red line but has a vibration in 3rd gear from 3,500 up. When it shifts into 4th it disappears... very weird. Its actually gotten worse lately. I'm thinking that there's something wrong with the tranny. Has anyone seen this before? What else could it be? bad tranny mount or u-joints? Its a goodwrench 700R4 and I have only 2K left on the 3yr/50,000 mile warranty and I'm getting worried. Thanks for your help!

Craig

 

Might check the motor mounts.(Drive shaft?).My02