DESCRIPTION & SPECS
GM 6L80 and 6L90 transmissions often suffer failure of the 4-5-6 clutch assembly due to OE design shortcomings. Not enough clutches and insufficient clutch piston-to-plate apply surface area causes clutch plate failure, especially when apply pressures exceed OE specifications. The other problem is flexing and bowing of the backing plate (coning), which is a primary source of clutch failure.Sonnax high capacity 4-5-6 clutch apply piston kit 104960-20K features a modified OE clutch apply piston and piston dam that are used in conjunction with a specially-designed toothed apply plate closest to the piston. The Sonnax toothed apply plate increases surface area between the apply piston and first friction plate resulting in more even distribution of apply force to clutch plates and allows a friction plate to run against the apply plate. This configuration eliminates OE waved plate. Since Powerglide-style, 45-tooth frictions are a popular 6L80/90 upgrade due to their wider friction surface, the toothed apply plate and the backing plate have a smaller inner diameter to accommodate that style. For best performance, use with Sonnax steels [104120-01] or [104120-02], BorgWarner high-energy frictions [104120-03] and Sonnax extreme duty 4-5-6 clutch hub and intermediate shaft [104680-45] (for 6L80) or [104690-45] (for 6L90). Solid backing plate design outperforms OE and aftermarket plates Toothed apply plate eliminates waved plate and allows for additional clutch capacity Use with Powerglide-style frictions, Sonnax steels and aftermarket, 45-tooth, 4-5-6 clutch hub
- Piston Kit; 4-5-6, High Capacity
- Use with Powerglide-Style, 45 Tooth Frictions and Steels, 45 Tooth 4-5-6 Hub
- High Performance/Heavy Duty
TRANSMISSIONS
NAME YEARS
6L80 2006 - 2020
6L90 2007 - 2020
VEHICLE FITMENT
YEARS VEHICLE DRIVE TYPES
2006 - 2009 Cadillac XLR RWD
2006 - 2009 Cadillac STS RWD
2007 - 2013 Cadillac Escalade EXT AWD
2007 - 2015 Cadillac Escalade ESV AWD, RWD, 4WD
2007 - 2015 Cadillac Escalade AWD, RWD, 4WD
2009 - 2015 Cadillac CTS AWD, RWD
2009 - 2020 Chevrolet Tahoe RWD, 4WD
2016 - 2019 Chevrolet Suburban 3500 HD 4WD
2008 - 2013 Chevrolet Suburban 2500 RWD, 4WD
2008 - 2014 Chevrolet Suburban 1500 RWD, 4WD
2015 - 2020 Chevrolet Suburban RWD, 4WD
2014 - 2017 Chevrolet SS RWD
2007 - 2020 Chevrolet Silverado 3500 HD RWD, 4WD
2007 - 2020 Chevrolet Silverado 2500 HD RWD, 4WD
2009 - 2020 Chevrolet Silverado 1500 RWD, 4WD
2016 - 2018 Chevrolet LCF 3500 4 X 2
2010 - 2019 Chevrolet Express 4500 4 X 2
2010 - 2019 Chevrolet Express 3500 RWD
2010 - 2019 Chevrolet Express 2500 RWD
2006 - 2014 Chevrolet Corvette RWD
2011 - 2017 Chevrolet Caprice RWD
2010 - 2015 Chevrolet Camaro RWD
2009 - 2013 Chevrolet Avalanche RWD, 4WD
2008 - 2013 GMC Yukon XL 2500 RWD, 4WD
2007 - 2014 GMC Yukon XL 1500 AWD, RWD, 4WD
2015 - 2020 GMC Yukon XL RWD, 4WD
2007 - 2020 GMC Yukon AWD, RWD, 4WD
2007 - 2020 GMC Sierra 3500 HD RWD, 4WD
2007 - 2020 GMC Sierra 2500 HD RWD, 4WD
2019 - 2019 GMC Sierra 1500 Limited RWD, 4WD
2007 - 2019 GMC Sierra 1500 AWD, RWD, 4WD
2010 - 2019 GMC Savana 4500 4 X 2
2010 - 2019 GMC Savana 3500 RWD
2010 - 2019 GMC Savana 2500 RWD
2008 - 2009 Hummer H2 4WD
2008 - 2009 Pontiac G8 RWD
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