BD Diesel Big Stack Shaft & Drum Kit. *Features:* * Big stack overdrive shaft, reaction plates, and large input drum * Large input drum apply area to increase toque holding by a further 16% * 54% increased torque holding capacity * 16 Overdrive friction surfaces * Billet QT100 Reaction plates * Billet machined Overdrive shaft spline * 33% more steel mass for better heat absorption * Raybestos clutches B29308L / B29309L are required (included in BD Build-It kits) *Warranty* Parts * 12-Months