This retrofit steering column is designed to fit your 1966 Chevy Chevelle, El Camino, or GTO and does NOT require modification to your original vehicle to install. Simply remove your old column, saving your original under dash mount and floor mount. These columns come complete with a neutral safety switch,(shift indicator is not included). The shift pattern on the column allows you to use either a 3-speed or 4-speed automatic transmission. A shift linkage(new or original)is required for installation and will attach to the lower shift arm provided on the column. Using an adaptor, add an aftermarket wheel and the gripping surface of the new wheel will be in the same location as the original.