- Internal Spline Tooth Count: 25
- Material: Steel
Sonnax turbine hub FD-HT-42HS with hardened internal spline fits early, single-plate Ford 4F50N (AX4N) converters. FD-HT-42HS replaces 4F50N (AX4N) OE turbine hubs that have two dimples on the turbine hub tower.
- Hardened internal spline for greater wear resistance
- Requires 10 rivets