Bad Vibration under torque

[MY90GT]

I've noticed a bad vibration when I first take off, and have the car under a fair amount of torque. If I go to brake torque the engine, it will vibrate back through the car, even though I'm not moving. The entire rear end has been replaced, new aluminum drive shaft. It's a automatic.

 

[85_SS_302_Coupe]

Harmonic Balencer.

 

[WANNA_BE_GT]

You might be a little surprised, but check your mechanical fan... If it is cracked, it will unleash a terrible fury on your car. Mine was cracked and whenever I romped on it, my whole car would vibrate. Ever since I went to my electrical one, no more vibration

 

[hllon4whls]

Harmonic Balencer.

Doubt it. Only if it is about to fly apart!

 

[85_SS_302_Coupe]

i dunno, that's just my guess. I've heard that just replacing the old stock one can make your car so much smoother it's not funny.

 

[MY90GT]

I did notice it's pretty cracked up. I have a new one, just haven't replaced it.
Maybe this weekend.

 

[MY90GT]

While I was checking the fan, I noticed while the engine was running that the harmonic balancer look like it was wobbling. It feels tight, but while it spinning, it looks like a wheel out of round. Can they come loose, or should I just replace it.

 

[WANNA_BE_GT]

I would start with the fan, then fry the bigger fish if need be