Boost Valve Kit With O-Rings Sonnax 4L80E 4L85E
Sonnax Boost Valve Kit for 4L80-E, 4L85-E GM 4L80-E and 4L85-E transmissions often encounter issues like uncontrollable line rise (up to 500-600 psi), high line pressure in Reverse, buzzing noises, and broken direct clutch drums or cases. These problems are typically caused by reverse boost oil entering the torque signal circuit due to wear-induced leaks at the sleeve and oil leakage past the aluminum balance plug. The Sonnax boost valve kit 34200-01K effectively addresses these issues. Key Features: Hardened steel boost valve with over 20% wider spools for enhanced durability and increased sealing contact area Annular grooves on boost valve spools reduce side loading and prevent wear High-quality steel boost sleeve with external O-rings ensures a positive seal, compensating for pump cover bore wear Includes a replacement aluminum balance oil plug with an O-ring for proper sealing and maintaining back pressure on the pressure regulator valve Drop-in Zip Valve™ parts for quick and easy installation Symptoms Addressed: Uncontrollable line rise High line pressure Broken parts Broken clutch piston Cause:Worn boost valve sleeve allows reverse oil leakage, and a worn end plug causes pressure regulator valve imbalance. Solution: This kit ensures proper regulator valve control with a drop-in O-ringed balance oil plug and boost valve sleeve. Kit Contents: Valve Sleeve Sleeve O-Rings (2) Balance Plug Balance Plug O-Ring Transmissions: 4L85E (MN8) 1989-UP, 4L80E (MT1) 1989-UP Vehicle ASTON MARTINDB7 2000 4 SP RWD V6 3.2LBENTLEYARNAGE 2002-2006 4 SP RWD V8 6.8LCHEVROLETEXPRESS 2005-2016 4 SP RWD V8 6.6LSUBURBAN 2500 1996-2007 4 SP R/4WD V8 8.1LVAN FULL SIZE 2500 1996-2009 4 SP R/4WD V6 4.3L V8 4.8L 5.7L 6.0L 7.4L 8.1L 6.5L 6.6L DIESELVAN FULL SIZE 3500 1995-2009 4 SP RWD V6 4.3L V8 4.8L 5.7L 6.0L 7.4L 8.1L 6.5L 6.6L DIESELC/K, PICK-UP 1500, C/K, PICK-UP 2500 1995-2000 4 SP R/4WD V8 5.0L 5.3L 5.7L 6.0L 7.4L 6.5L DIESELEXPRESS 2002-2016 4 SP RWD V8 4.8L 6.0LSILVERADO 1500HD, SILVERADO 1500SS 1998-2007 4 SP R/4WD V8 6.0L 6.5LSILVERADO 2500, SILVERADO 3500 2001-2007 4 SP R/4WD V8 6.0LSILVERADO 2500HD 2001-2007 4 SP R/4WD V8 6.0LSUBURBAN 1500 1995-2008 4 SP R/4WD V8 6.0L 6.5L DIESEL 7.4LTAHOE 1995-2003 4 SP R/4WD V8 6.0L 8.1L 6.5L DIESELGMCSAVANA 2005-2016 4 SP RWD V8 6.6LYUKON XL 2000-2006 4 SP R/4WD V8 6.0L 8.1LSAVANA 2002-2016 4 SP RWD V8 4.8L 6.0LSIERRA DENALI 1998-2007 4 SP R/4WD V8 6.0L 6.5LSIERRA 2500, SIERRA 3500 2001-2007 4 SP R/4WD V8 6.0LSIERRA 2500HD 2001-2007 4 SP R/4WD V8 6.0LJAGUARXJ12/XJR/XJS 1994-1997 4 SP RWD L6 4.0L V12 6.0L Alternate Words: Automatic Transmission, Reprogramming, Improvement , Correction, Shift , Valve Body Rebuild Kit