Boost Valve Kit Sonnax with Encapsulated Relief Valve 4L80E 4L85E
Sonnax Boost Valve Kit for 4L80-E, 4L85-E Vehicles equipped with GM 4L80-E and 4L85-E transmissions often face issues such as uncontrollable line rise (up to 500 psi), high line pressure in Reverse, and broken direct clutch drums or cases. These issues are typically caused by excessive EPC torque signal pressure. The Sonnax self-regulating boost valve kit 34200-10K addresses these problems by effectively limiting EPC pressure. Key Features: Hardened steel boost valve with an encapsulated relief valve that exhausts EPC pressure if it exceeds 95-105 psi 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 Closely toleranced sleeve restores hydraulic integrity between the valve and sleeve O-Rings added to the sleeve ensure a positive seal, compensating for pump bore wear Drop-in Zip Valve™ parts for quick and easy installation Symptoms Addressed: Uncontrollable line rise High line pressure Broken parts Broken clutch piston Cause:Unregulated EPC pressure forces the pressure regulator into a high line position. Solution:This self-regulating Reverse boost valve limits EPC pressure to 95–105 psi, using the Sonnax drop-in encapsulated relief valve. Kit Contents: Valve Sleeve O-Rings (2) 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 DIESELGMCYUKON XL 2000-2006 4 SP R/4WD V8 6.0L 8.1LSAVANA 2002-2016 4 SP RWD V8 4.8L 6.0L 6.6LSIERRA 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 6.0LYUKON XL 2000-2006 4 SP R/4WD V8 6.0L 8.1LISUZUTRUCK NPR, W4 1987-2008 4 SP RWD V8 5.7L 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