A618, 47RH/RE, 48RE (310mm) Multi-Plate Performance Converter, BorgWarner 310mm LU (A618, 47RH/RE, 48RE)

Performance Converter Kit
Part No. BW-RK-4

This unit requires the use of Sonnax Smart-Tech® big input shaft kit 22121B-08K.

View Instructions

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 & high-torque capacity friction elements deliver solid holding power
  • Turbine Hub
  • Energizer Ring
  • Seal PTFE
  • Radial Lip Seal
  • Front Cover Thrust Washer
  • Damperless Piston
  • Clutch Plate with External Splines
  • Clutch Plate with Internal Splines
  • Front Cover
  • Unit Size: 13.5"
  • Core: Borg Warner 310mm
  • Dampered: No
  • Lockup: Multi-Plate
  • Transmission Unit: A618, 47RH, 47RE, 48RE
  • Clutch Material: HTE
  • Turbine Hub Input Spline Count: 35

Where to Buy

  • Existing Customers: Contact your sales representative.
  • New Customers: Fill out the form and a sales representative will contact you.
  • A618, 47RH/RE, 48RE (310mm) Multi-Plate Performance Converter, BorgWarner 310mm LU (A618, 47RH/RE, 48RE) Performance Converter Kit BW-RK-4

Sonnax Performance Converter Kits

Engineered to Deliver Builds that Last

Designed from the ground up to outperform OE and other aftermarket components, Sonnax has you covered with a full line of performance converter kits for gas and diesel vehicles. Offering the widest variety of options in the aftermarket, these innovative kits deliver customized performance and value.

  • Small/Large Diameter
  • Single-Plate/Multi-Plate/Non-Lockup
  • Dampered/Damperless


Choose the right kit for your rebuild!