298mm LU (250C, 350C, 200-4R, 4L60 & E), 4L60 (700-R4), 4L60-E, 200-4R (298mm) Single Plate Performance Converter (Mounting Ring)

298mm Performance Converter Mounting Ring Kit
Part No. GM-RK-11

Adapts front-wheel drive GM 245mm cores to GM 298mm applications with 30-tooth input splines.

View Instructions

Sonnax 298mm performance converter mounting ring kit GM-RK-11 allows an early GM 245mm core to be adapted for use in 4L60 (700-R4) and 4L60-E applications that originally came with 298mm LU torque converters. Adapts late GM 245mm cores when used with turbine hub [GM-HT-53HS].

The kit is designed to work with early-model GM 245mm piston/damper assemblies. 4L60-E units with EC3 systems MUST use clutches with Woven Carbon or High Thermal Engaging (HTE) friction material.

High torque applications can overpower the torque capacity of stock GM 245mm single disc clutch and damper assemblies. The ability of this single disc clutch to handle a specific torque load is dependent on many factors, including the amount of input torque and the strategy that is used in applying the torque converter clutch. Sonnax does not guarantee that the capability of the 245mm damper assembly will be adequate in all applications.

  • Impeller Hub
  • Turbine Hub
  • Thrust Washer
  • Mounting Ring
  • Flathead Bolts (3)
  • Pilot
  • Unit Size: 10"
  • Core: GM 245mm
  • Dampered: Yes
  • Lockup: Single-Plate
  • Transmission Unit: 4L60, 4L60-E
  • Turbine Hub Input Spline Count: 30

Where to Buy

  • Existing Customers: Contact your sales representative.
  • New Customers: Fill out the form and a sales representative will contact you.
  • 298mm LU (250C, 350C, 200-4R, 4L60 & E), 4L60 (700-R4), 4L60-E, 200-4R (298mm) Single Plate Performance Converter (Mounting Ring) 298mm Performance Converter Mounting Ring Kit GM-RK-11

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!