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280mm LU (4L60-E) “VJCX”, 298mm LU (250C, 350C, 200-4R, 4L60 & E), 300mm (4L60-E)

Friction Ring
Part No. S20250WC

Package Quantity: 5

  • Material: WC
  • Outer Dia.: 11.125"
  • Inner Dia.: 10.000"
  • Thickness: 0.020"

April 24, 2010

Rebuilding the New GM Captive Clutch Without Fear

Ed Lee

Topics: Torque Converter GM 245mm LU (3T40, 3L30, 200C, 4T60-E, 4L60 & E:S-10 only) Torque Converter

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May 24, 2011

Woven Carbon Wear Characteristics

Lowell Caltrell

Topics: Shop Practices Torque Converter

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July 28, 2006

Rebuilders Rally to Crack the Code: Converter Identification

Ed Lee

Topics: Diagnostics And Theory Torque Converter Ford GM 400 (3L80), AT-540 Torque Converter AODE, 4R70W, 4R75W Torque Converter AOD (FIOD) Torque Converter C4, C6, FMX 12", C4 11-1/4" Torque Converter 298mm LU (250C, 350C, 200-4R, 4L60 & E) Torque Converter

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December 27, 2007

Identifying those GM 300mm Dampers

Ed Lee

Topics: Torque Converter GM 280mm LU (4L60-E) “VJCX” Torque Converter 300mm (4L60-E) Torque Converter

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January 06, 2016

A Slippery Slope - The What (and Why) of Woven Carbon Friction Material

Topics: Diagnostics And Theory Torque Converter

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January 05, 2016

Torque Converter Journal: A Slippery Slope - The What (and Why) of Woven Carbon

Topics: Torque Converter Journals Torque Converter ZF Allison 1000/2000/2400, 2006-Later Performance Converter Torque Converter ZF8HP55 Torque Converter ZF8HP45 Torque Converter

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  • Existing Customers: Contact your sales representative.
  • New Customers: Fill out the form and a sales representative will contact you.
  • S20250wc

Bonding Pressure Calculator

Enter the details of your bonder's ram/piston and the friction ring you are bonding into the calculator here to find the piston pressure required to create the desired pressure at the ring.


Piston Pressure Required:

Minimum Pressure:

Maximum Pressure:

Torque converter clutch material is engineered by the OEMs to operate in conjunction with vehicle computer programming. To meet the varied needs of the aftermarket, Sonnax strives to offer a full line of friction products in a wide variety of sizes and materials. Rebuilders should choose the product that best matches their specific vehicle requirements.

Materials Designed for Slip Converters

  • HTS - Designed for high-thermal capacity applications. Replaces spun-wound, woven or other carbon-based materials.
  • WC - Genuine OE woven carbon material developed by OEMs for continuous slip GM and Ford applications.

Materials Designed for Full Lockup Converters

  • HTE - Thermal capacity of Kevlar®, with improved consistency and shudder resistance.
  • HTL - High thermal and exceptional torque capacity for the most demanding torque-holding applications.
  • XTL - 30% More torque holding capacity than HTL. Available only for a small range of extreme-duty lockup applications.
Learn more about Friction Rings