700R4 - Vibration Problem

[craig0ry]

I was gunning it a while ago and I felt a "clink" - like something was letting go, and the car began to vibrate. It felt like a horrible misfire - but it's not. All mounts are good (engine/trans/exhaust), all the U-joints are good. The car only has a vibration problem in gear. As soon as I throw it in drive, it starts shaking. The trans feels loose and gas mileage and power are WAY down.

I put the car on a lift and the noise is coming from the very rear of the transmission. What should I look for? I am going to be dropping the trans.

 

[grapeknutz]

It sounds like torque converter chatter, does it happen just before the trans kicks down from O.D.?

 

[G Winter]

are you sure about the location of the noise. sounds a bit like a broken flexplate.

 

[craig0ry]

Okay but it's not just noise - the entire chassis vibrates with it. The car also is down on power and gas mileage significantly - but it is not the engine. I think it is time for a new tranny...

 

[Tim Scales]

I have a very similar problem with my '92. It only happens when the torque converter "Unlocks" or whille I am accelerating at a moderate rate. All C4's I have owned do this. low miles, high miles, it doesn't matter. I have owned several in the past 10 years and all the C4's did it. I was told over and over it is nothing to worry about. It does get quite annoying. Especially over hilly terrain. No "easy fix" that I know of. If anyelse knows of anything please let me know.