I have a problem with one of my 69 911S. It is the one I use for track events and it has developed a whine on 4th gear only when the tranny is warm and running at a constant speed. Is this "the problem" with the intermediate plates?

Also, I'm looking in to rebuilding the box and taking advantage to optimize my gears for Sebring/Daytona/Homestead/Road Atlanta and VIR. Any suggestions on gear ratios (or letters), I use stock 15" fuchs with 205/50's and my target RPM is 7000.

My motor is a slightly modified 69 2.0S with Webers and MSD (for now anyway!)

Your help is appreciated. Juan (69 S Street and 69S track)