C4, C6, FMX 12", C4 11-1/4", C6 Performance Converter

Performance Converter Kit
Part No. FD-RK-4

View Instructions

Sonnax performance converter kit FD-RK-4 allows builders to assemble a high performance converter with minimal effort.

  • Fully machined cover with bushing installed
  • Unit-specific design for hassle-free installation
  • Oil flow grooves and holes increase fluid flow to keep converters running cooler
  • Turbine hub features a larger flanged diameter to increase the strength rigidity of the turbine
  • Clear, detailed instructions
  • Inner Stator Race
  • Thrust Washer
  • Stud Covers (4)
  • Pilot
  • Set Screws (4)
  • Flanged Impeller Hub
  • Front Cover, Dual Bolt Pattern
  • Front Cover Bushing (Installed)
  • Turbine Hub 31-Tooth
  • Unit Size: 10"
  • Core: GM 245mm
  • Dampered: No
  • Lockup: No
  • Transmission Unit: C6
  • Bolt Circle Dia.: 10.50"
  • Bolt Circle Dia.: 11.40"
  • Turbine Hub Input Spline Count: 31

Where to Buy

  • Existing Customers: Contact your sales representative.
  • New Customers: Fill out the form and a sales representative will contact you.
  • C4, C6, FMX 12", C4 11-1/4", C6 Performance Converter Performance Converter Kit FD-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!