Well, I searched for overdrive noise, but most of the posts seemed to be about throwout bearing issues. Mine's a little different, so here goes.
My R10 OD box was installed a number of years ago, and has worked flawlessly and quietly. Recently I took the car out for a drive, shifted into and out of OD several times, no issues. I come to a stop sign, take off and go through the gears, then shift into OD, and the OD suddenly starts whining. Stopped the car, went through the same sequence several times, the gearbox is totally silent until the OD engages and you step on the gas, then a whine. After a few tries the whining starts getting a little louder, so I stopped, locked out the OD and drove (silently) home.
So, has anyone ever had this happen and find a cause that fixed it? Unfortunately, the guy who rebuilt the box and installed it retired and moved a few states away, so I can't take it to him. The tranny itself seems fine, and the whining only occurs under power in 3rd over. Maybe a bearing or a thrust washer? Any thoughts?
Marty