The G50 transmission (1987 Carrera 3.2 onward) uses needle bearings in the clutch fork that are widely known to fail. The preventive fix is converting the clutch fork to plain bearings — treated as a non-negotiable upgrade on serious G50-equipped cars.
G50 transmission (1987+) — clutch fork needle-bearing failure mode
Porsche 911 (G-series) · drivetrain