4L80E 4L85E Transmission Boost Valve O-Ring Style Sonnax 34200-01K

4L80E 4L85E Transmission Boost Valve O-Ring Style Sonnax 34200-01KCommon problems in vehicles with a 4L80-E transmission are uncontrollable line rise (upward of 500-600 psi), high line pressure in reverse, buzzing noise, broken direct clutch drums and/or broken cases. These problems are usually caused by reverse boost oil that enters the torque signal circuit due to a wear-created cross leak at the sleeve. High line pressure and buzz is created by oil leakage past the aluminum balance plug. The Sonnax replacement assembly 34200-01K eliminates these problems.Hardened steel boost valve has over 20% wider spools to provide better durability and increased sealing contact area.Boost valve spools have annular grooves to reduce side loading that causes wear.Quality steel boost sleeve with external o-rings provides positive seal to compensate for pump cover bore wear.Kit includes a replacement aluminum balance oil plug with an o-ring to ensure proper sealing and adequate back pressure on the pressure regulator valve.Kit includes instructions to retrofit parts dating back to 1989.ContentsValveSleeveSleeve O-Rings (2)Balance PlugBalance Plug O-RingAPPLICATIONS Hummer H1 1993-2005 V8 Gas 6.5L Diesel 4 Spd RWD 4X4Escalade, ESV, EXT 2006-2007 V8 4.8L 5.3L 4 Spd RWD AWDAvalanche 2001-2003 V8 8.1L 4 Spd RWD 4X4Express, Savana, 2500-3500 1996-2009 V8 4.8L 5.3L 5.7L 4 Spd RWD 4X4Express, Savana, 2500-3500 1996-2009 V8 6.0L 7.4L 4 Spd RWD 4X4Express, Savana, 2500-3500 2006-2010 V8 6.6L Diesel 4 Spd RWD 4X4Express, Savana, 3500 2002 V8 8.1L 4 Spd RWD 4X4Silverado,Sierra,1500-3500 1995-2007 V8 5.0L 5.7L 6.0L 6.5L 4 Spd RWD 4X4Silverado,Sierra,1500-3500 1995-2007 V8 6.6L Diesel 4 Spd RWD 4X4Suburban 1500-2500 1995-2007 V8 5.7L 6.0L 4 Spd RWD 4X4Suburban 1500-2500 1995-2007 V8 6.5L Diesel 4 Spd RWD 4X4Tahoe, Yukon 1995-2007 V8 5.7L 6.0L 4 Spd RWD 4x4Tahoe, Yukon 1995-2007 V8 6.5L Diesel 4 Spd RWD 4X4NPR Truck 1991-2004 V8 5.7L 4 Spd RWDNPR Truck 2005-2010 V8 6.0L Gas 4 Spd RWDXJS 1993-1996 L6 4.0L; V12 6.0L 4 Spd RWD    Please be sure your Pan has 17 Bolt Holes for your Transmission to be a 4L80E  Parts ship daily from our distribution center.FREE SHIPPING on US Orders GOT QUESTIONS on your specific Year/Make/Model? Send us a message ¿Habla español? Escríbanos con el año, la marca, y el modelo de su vehículo. This item is packaged for Wholesale Distribution WARRANTY requests need to be accompanied with the appropriate codeas diagnosed by a professional transmission shop.Vehicles must be professionally diagnosed for solenoid failure prior to purchase.We cannot guarantee any one item will fix all transmission problems.Solenoid failure is often accompanied by additional failures;for example valve body failures, internal wear or damaged hard parts Visit our eBay Store: Phoenix Transmission Parts  For all of your Automatic Transmission Part needsCheck out my other items!Be sure to add me to your favorites list!