Performance Converter Kit FD-RK-23 Transmission Unit: 4R100 Core: Ford 4R100, 6-Stud Dampered: No Lockup: Multi-Plate Unit Size: 12.5" Clutch Material: HTE Turbine Hub Input Spline Count: 31
Performance Converter Kit FD-RK-22 Transmission Unit: 4R100 Core: Ford 4R100, 6-Stud Dampered: Yes Lockup: Multi-Plate Unit Size: 12.5" Clutch Material: HTE Turbine Hub Input Spline Count: 31