Reference Details
- Availability
- factory
- Limited-slip
- Yes
- Notes
- The 1971 Ford Car Shop Manual identifies letters as locking-axle codes. R decodes the already-established standard 3.25 Traction-Lok path and S decodes the documented 3.50 locking path. The manual's broader Ford and Mercury code chart is not a Cyclone Spoiler option-availability matrix.
- Ratio
- Code R = locking 3.25:1; code S = locking 3.50:1
- Type
- rear axle