ok so i posted this once before and tried all the suggestions that were given. no luck. so here it is again. at about 3000 to 3500 rpm the car/ motor vibrates. i changed the drive shaft, tranny, tranny mount, oil and u- joints. the propblem seems to be from the motor not the drivetrain. only thing left that i can do myself that i could think of was the motor mount but they don't look bad. any help would br great. i need to fix it so i can sell it.

 

no ideas?

 

jack the car up and unbolt the TQ converter and slide it back then start the car and run it then you know if it is from the tq converter back or the motor/flexplate. if you have a auto.

manual push the clutch in and give it gas ant if it vib then it is the clutch/flywheel or the motor