Designed to give transmission positive shifting and shaft center line integrity Made from 6061 precision machined aluminum Holds centerlines within .0005" Incorporates wider, heavy duty bearings that are retained with beveled retaining rings to eliminate bearing end play Shifter shafts are solid, true center line and have rigid strength that replaces the OEM hollow shafts Includes trap door with bearings and shifter shafts Made in the USA. TRANS DOOR 6SPD BLACK