@KR500 posted:Hi, yes my first thought was “oh Lord not the gearbox”! Thinking maybe the diff clutches started acting up with the new pressures from spirited corners after years of not being used. I knew the bearings in the uprights had no movement while doing the classic 6/12 and 9/3 o’clock pull testing by heavy hands. So before I started tearing the uprights out I spoke with Dennis Q. We did a couple of tests Dennis suggested (they all showed a worn but fully functional diff section) and he said without opening it up he strongly suggested the bearings in the uprights. Another friend ex-Porsche racer turned early 911 restorer also strongly suggested the bearings in the uprights. Knowing our OEM rear discs were at the low limit we decided to go in and replace axles, bearings, discs to eliminate that concern and hopefully clear up the issue. I’m not holding my breath because further inspection of the old bearings showed no rust, dirt or damage with the shields removed. However as above one of the axles was badly beaten up and the other showed minimal wear/damage.
What rear discs did you use?
Are they dimensionally a substitute for the originals?