Torque-Biasing Limited Slip Differential, 901 Gearbox (1969–74)
Helical torque-biasing differential whose patented cam loads the pack when a wheel unloads — the failure mode that makes an ordinary helical diff behave like an open one.
Drivetrain In production confidence: medium
Manufacturing
| Manufacturer | Wavetrac (Autotech Driveline) |
|---|---|
| Origin | 🇺🇸 United States Manufactured here Autotech Driveline states design, development and manufacture in the USA. |
| Process | CNC Machined |
| Additively manufactured | No |
| Material | 9310 Alloy Steel |
| Notes | Internal gears in 9310 alloy steel; bodies machined from case-hardened steel billet. No clutch packs to wear. |
Fitment
| 901 | All models (1969–1974) 901 gearbox. |
|---|
Sources
- Wavetrac Limited Slip Differential / Porsche 901: 911, 914 1969-74 — MAPerformance, accessed 2026-08-17