R Walter

On the first truck in my sig, I just had the bearing in the overdrive unit replaced at 187,000. The bearing is a large 6 inch bearing.

Has anyone else experienced a similar failure in their overdrive unit?

cwebb710

What led you to the conclusion it was this bearing? Never heard of it intrested in this

Robert Rausch

How many miles on the bearing? Maybe a bad bearing was installed.

R Walter

I just had the overdrive unit rebuilt at 187,000 miles. The bearing was the only item replaced other than gaskets. The clutches all were good inside the unit. Cost me $500.

Prior to rebuild, I could hear the noise from the failing bearing as a high-pitched whine whenever the truck was in overdrive. The mechanic who did the rebuild is somebody I know and trust and builds and sells high-performance torque converters for the Dodge diesel transmissions. He also has a thirty year history in Dodge auto trannys.

There was nothing to do, of course, with the DTT valve body and torque converter.

Robert Rausch

Are you saying the bearing is bad again? I'm not quite sure what your first post meant.

R Walter

The bearing has not failed but one time. Sorry for any lack of clarity. My second post was only a furtherance to my first post. The bearing failed ONCE ONLY and I then had the overdrive unit repaired.

R Walter

I'm surprised more auto trans owners have not had a similar problem.

9812vram

I've had lots of these OD's apart and never seen one with a bad rear bearing... That being said, a bearing doesn't always fail due to "normal wear and tear" or "over time". All it takes is one soft spot in one ball or the race and a two day old bearing will begin to come apart. The whining sound is a characteristic of a pitted race. Your bearing likely came from the factory with a minor imperfection that took that many miles to make itself known...

toms73novass

I rebuilt a core transmission and the rear bearing that was toast, which caused metal to get into other parts of the trans. I was not my trans originally so I do not know its history.