Shallow ring design. For use only with converters with internal turbine support. Input shaft failure and spline twist are common as power levels increase. Sonnax extreme strength input shaft kit 28751-06K is engineered with exceptional reliability and durability to withstand these forces. Features unique shallow seal grooves which do not weaken the shaft like common deep-groove designs. Custom heat-treated aerospace alloy Advanced torsional design Rolled front and rear splines as well as other unique design features Contents: Shallow Ring Input Shaft Shallow Seal Rings (4) 2 Extra Specs: Front Spline Tooth Count: 30 Rear Spline Tooth Count: 19