BAKER (DD411P) Direct Drive 6-Speed Builder's Kit Fits 2001-2006 FLT-FLH Models; 3.24 1st Gear 6th gear is good for a 450 to 500 rpm reduction at highway cruising speeds, depending on your application The DD6 comes equipped with our proven and perfected helical gear design for smooth and silent operation in the cruising gears, 4th through 6th The shift drum utilizes a fixed spindle design for smooth, low inertia, indexing; Neutral is easily located with the redundant neutral detent design, incorporated into the architecture of the shift system Direct drive technology allows the 6th gear to operate at 99 percent efficiency