Hi All,

First time posting, but I have been visiting this site for years. Great stuff here.

I have a 1996 Toyota 4Runner Limited 4WD with 194K miles. Transmission and drive train seem normal except for one symptom which has stumped me.

There is a loud rumble and strong vibration coming from what I believe is the transmission under very light to neutral load. It is only noticable at highway speeds (above 55 mph or so) and gets worse the faster I am going. At 80 mph the rear view mirror is rendered useless from the vibration. It only occures when I am just starting to give it gas (1st 5% past neutral load or so) or just after all load on the transmission is removed when I let up on the gas. In other words, I have to always either be giving it gas, or have backed off significantly. Otherwise, I get the strong vibration and rumble sound. If I put it in neutral, I can coast just fine without any symptoms. This leads me to believe it is not in the drive shafts, axles, or wheels.

Has anyone ever encountered something similar?

 

Dealing with the same problem currently any chance you figured it out?