Sonnax
4L80E 4L85E Transmission Boost Valve O-Ring Style Sonnax 34200-01K
4L80E 4L85E Transmission Boost Valve O-Ring Style Sonnax 34200-01K
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$34.99 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
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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
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