After having my current 312 balanced i still noticed a drive line vibration. So checked the pinion angle, it was 3 degrees. Had the drive shaft balanced and straightened. Still had a vibration????. i had installed AC and was having problems with getting a belt the right size. I then installed a idler pulley from a 5.8L ford engine. Fit like a glove found a longer belt and working great now. I know sounds off topic, however while watching the idler and belt I observed the balancer weight moving back and forward on the dampener. The ring was actually moving rearward and rubbing on the oil pan. Several years ago I purchased a new harmonic balancer from John Mummert, and now was the time to install.

Viola!! no more vibration. It is so SMOOOOOOOOOOOOOOOOOOOOOTH. Keep and Eye on those old balancer's.



Jim

  Jim Rowe Elkhorn, NE