Firepunk Sonnax Smart-Tech Big Input Shaft Kit | 1994-2007 Dodge Ram 5.9 Cummins

The Sonnax Smart-Tech® big input shaft kit 22121B-08K is the ultimate solution to prevent input shaft spline twist and breakage in high torque Chrysler 47RH, 47RE and 48RE diesel applications. Compared to the best 300M 23-spline shafts, the Sonnax input shaft is 35% stronger at both the spline portion and the sealing ring/cross-hole area, eliminating concerns about failure at these critical points.

The larger sealing ring and cross-hole area require a custom stator/pump cover assembly. The stator assembly features standard 48RE tube splines made of high strength steel, improved retention in the stator body, 48RE matched pump porting, and special rubber seals to eliminate oil leakage between the cover and pump body.

The longer direct (front) clutch hub portion of the shaft has longer splines that allow for one extra OE thickness direct friction plate when used with the included thinner billet aluminum direct piston, all while keeping OE thickness steels, backing plate, OE waved retaining ring and OE clutch clearances.

Some common aftermarket modifications designed to add clutches reduce steel thickness, which decreases the heat absorption capacity of the clutch pack. Others reduce clearance and eliminate the waved retaining ring, which contributes to excess 2-3 shift overlap. The Sonnax kit avoids these problems by increasing the number of frictions from five to six, adding to the steel mass of the clutch pack, and maintaining the OE thickness backing plate and clearances for the optimum combination of capacity and durability.

• Extreme duty, 1-1/8" diameter 35-spline input shaft
• .100" larger diameter at the sealing ring cross-hole area
• One-piece shaft forged from ultra-high strength 300M steel eliminates the weak connection between shaft and clutch hub
• Keeps OE oil flow areas and eliminates leakage for predictable, trouble-free lockup, release and apply
• Custom stator assembly optimizes performance and long-term durability

Contents:

• Input Shaft, 35 Spline with Extended Hub
• Stator Support Assembly
• Direct Clutch Piston
• Steel Clutch Plate, .068" Thick
• Seal Rings (3), 1 Extra
• Quad Ring Seals (4)