GM 55-64 Car (55p) / Posi Unit / 17 Spline - Limited slip clutch style posi unit
- Fits 1955-1964 GM passenger car drop out / 3rd member
- Compatible with 3.90 & numerically less gear ratios (3.08, 3.36, 3.55, 3.73, 3.90)
- Nodular Iron Case w/ Forged 4130 Internals
- High-Quality Composite Clutches
- 100% Re-Buildable
- Does not fit rear ends with c-clip axle shafts
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