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1986 911Carrera Transmission 5th gear load undulating resonating noise

Transmission and Clutch

Vehicle Information: Model: Carerra; Year: 1986; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 51,900;

During the last 6 months, a loud up and down or undulating/wavering noise is coming from the transmission (5th gear only) between 2900 up to around 3,300 ( a popular 70 -80 MPH speed. One mechanic I occasionally see initially thought it was the alternator charging. A second one said it that it wasn't the alternator but rather the transmission gear. We changed the oil in it from regular to sythetic (did not help). He also indicated that the 5th gear could be worn to point that it makes that sound.

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