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Remember, transmissions have variations based on year, make, model and engine size, as well as for 2WD, AWD, 4x4, gas, diesel or hybrid and in some situations half years.  We encourage you to chat or call toll free with one of our knowledgeable staff members that will assist you in finding the correct part the first time and answer any questions you may have regarding parts for your build. Our goal simply put, is to get you moving with one order.

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Sonnax

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

Regular price $24.65 USD
Regular price Sale price $24.65 USD
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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 √ā¬ŅHabla espa√ɬĪol? Escr√ɬ≠banos con el a√ɬĪo, la marca, y el modelo de su veh√ɬ≠culo. 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!¬†