1st-2nd & 2nd-3rd Shift Valve Spring Kit Sonnax 4L80E 4L85E
Sonnax 1-2 & 2-3 Shift Valve Spring Kit for 4L80-E, 4L85-E In GM 4L80-E and 4L85-E transmissions, proper 4th gear operation relies on signal A oil force overpowering the 1-2 shift valve spring and signal B pressure. If the 1-2 shift valve doesn't fully stroke, drive oil to the second and direct will be compromised, leading to issues such as 2nd gear starts, neutral after 2-3 shift, or no 4th gear. These problems are often compounded by worn AFL limit bores, leaking O-rings, and solenoids. Sonnax 1-2 and 2-3 shift valve spring kit 34994-02K replaces the original springs to restore proper signal pressure and improve shifting. Benefits: Allows salvage of stripped cores Restores signal pressure to shift solenoids Improves shift performance Note: Springs must be used together. This kit does not fix leaking solenoids or seals in the solenoid signal or actuator feed limit circuits. For AFL valve repair, see kit 34200-16K. Kit Contents: 1-2 Shift Valve Spring 2-3 Shift Valve Spring Symptoms Addressed: Repeated Solenoid B codes 86 & 87 2nd Gear starts No 4th Gear 3-4 Neutral No 3rd Gear Cause: Low signal pressure to shift solenoids A and B. Correction: Recalibrated springs for 1-2 and 2-3 shift valves. Transmissions: 4L85E (MN8) 1991-UP, 4L80E (MT1) 1991-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 6.0LISUZUTRUCK 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, 3499402K