Differential · Transmission
| System | Transmission |
| Subsystem | Differential |
| Assembly | Ring Gear (Self-Locking Differential) |
| Fastener | Bolt |
| Thread | M12x1.25 |
| Grade | 11.9 |
| Years | 1972–1981 |
| Vehicles | 911SC, 911T/E/S |
| Confidence | Factory Verified |
Source: Porsche 911 Workshop Manual, Section 3 (Transmission), page 312 (Tightening Torques, Type 915 Manual Transmission)