90gt-s nasty vibration

[toyotawarrior]

long story, a friend of a friend has a 90 celica gt-s auto, the car has a really nasty vibration, it really start around 30mph all the way up to 75, from 80 till the cut off is fine, vibration feels thru the whole car but more on the driver's front, car has new tires, wheels are tight, tires are balance, half shaft was replaced, wheel bearing done, new rotors and pads, new control arms with bushings, new struts, even last time i heard they install a new trans., it all is on accel, when u step on the gas the car just goes crazy, u let the gas off and it goes away, it the gas again the vib starts, if u just cruise and sustaing the speed vib is gone,hit the gas to accel and the car goes cazy again, my friend really likes car, at this time the car is soooooo close to get set on fire is unreal, the only thing stopping that from happening is me trying to find the problem, afte so much money is personal. he bought the car used, tet drove it and tought it was a wheel balance consern, now is a headache, any ideas, thank u

[carheadz]

Check the motor mounts. One of the studs possibly snapped off. Happened to me.

[Blane]

Vibrations like that can only happen with the tires or the engine or tranny in extreme cercamstances. One of my friends decided to be a jack a$$ and stuck a heavy welders magnet in the inside of my steel wheel on my previous chevy car. It really caused a vibration throughout the car.

or it could be a weird slip of the clutch. oh wait its an auto so a loose belt?

[toyotawarrior]

well now im thinking, the bearing that hold the pass. half shaft