When diesel trucks are modified for racing or street use, OE clutch plates slip and fail to hold. Upgrading to a Sonnax multi-plate converter is the solution of choice for these types of build.

Sonnax performance converter kit BW-RK-4 is available for BorgWarner 310mm converters. The Sonnax kit pairs the salvaged OE fluid coupling parts (impeller, stator and turbine) with new heavy-duty front cover, clutch plates, piston and turbine hub to increase overall converter capacity. Clear instructions, minimal setup and easy assembly make these foolproof upgrades. All new kit components eliminate the rework and limitations associated with salvaged parts.

• Forged chromoly damperless piston features heat-treated splines and resists bending under extreme lockup pressure
• Increased oil flow improves cooling and lubrication of clutch plates
• Three high-thermal, non-segmented and high-torque capacity friction elements deliver solid holding power