T Kono

Well after looking under the car today, they probably call it "rear" because the doughnut is way back by the tranny, not up front like I imagined.

fpb111

You are mixing two different thread subjects. The subject GUIBO is a flex disk on 4 wheel drive 911 drive shafts.
The cross member is a big lump of steel that was changed to a big chunk of (lighter) aluminum in later models. Swap old out for newer save weight at the rear and go faster than anyone that still has the steel one.
OOPS, got caught in a necro-thread..