BF Gears Usa K Series Dog 1-2 Heavy duty input shaft Extra spline length for twin and triple disc clutches Replaceable dog rings Stock size gears Ratio 2.6/1.6 helical 2.8/1.9 straight PARTS INCLUDED Shaft 1st gear counter 2nd gear counter 1st gear dog ring 2nd gear dog ring Hub and slider Suggested for 1000hp and under