hi im new on this forum and i have a 2002 c230 sports coupe with a 2.3l 6spd tranny. i have a little over 106,000 miles on it.

after driving on the highway from work i noticed a little grinding noise coming from the rear of the vehicle. as a drove for about another 20-30 miles the noise got worse. it wa happening at any gear and got worse around 2500 to 3500 rpms. third gear was teriable. i also noticed that if i drop the car in neutral, it was still making noise recardles of the rpm beaing at idel. as soon as i go under 10 mph on neutrol the noise disapears. the noise mad is soming grinding. no vibration or power lose. when in neutrol the prms a strong. clutch doesnt slip and everything is dry underneath the car.

i took the car to my mechanice. he put on the lift and took out the drive shaft. he told me that the middle x like goint was bad and had it rebuild. after reinstalling the driveshaft i took it for a spin and nothind changed.

i left the car in his shop and came back to him the next day on saturday morning. he took out the shaft again and said he wats to but it on the machine and spin it to see if its bent. if its ok than he is doing to drop the rear end. odviously my mechanice doesent now whats wrong and i dont want him to take everything apart. please help me with the solution of this problem and any recomindations on how to solve it or who to go to for help. im in the new york city area.

thanks