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

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

Common 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.
  • Valve
  • Sleeve
  • Sleeve O-Rings (2)
  • Balance Plug
  • Balance Plug O-Ring

APPLICATIONS

Hummer H1 1993-2005 V8 Gas 6.5L Diesel 4 Spd RWD 4X4

Escalade, ESV, EXT 2006-2007 V8 4.8L 5.3L 4 Spd RWD AWD

Avalanche 2001-2003 V8 8.1L 4 Spd RWD 4X4

Express, Savana, 2500-3500 1996-2009 V8 4.8L 5.3L 5.7L 4 Spd RWD 4X4

Express, Savana, 2500-3500 1996-2009 V8 6.0L 7.4L 4 Spd RWD 4X4

Express, Savana, 2500-3500 2006-2010 V8 6.6L Diesel 4 Spd RWD 4X4

Express, Savana, 3500 2002 V8 8.1L 4 Spd RWD 4X4

Silverado,Sierra,1500-3500 1995-2007 V8 5.0L 5.7L 6.0L 6.5L 4 Spd RWD 4X4

Silverado,Sierra,1500-3500 1995-2007 V8 6.6L Diesel 4 Spd RWD 4X4

Suburban 1500-2500 1995-2007 V8 5.7L 6.0L 4 Spd RWD 4X4

Suburban 1500-2500 1995-2007 V8 6.5L Diesel 4 Spd RWD 4X4

Tahoe, Yukon 1995-2007 V8 5.7L 6.0L 4 Spd RWD 4x4

Tahoe, Yukon 1995-2007 V8 6.5L Diesel 4 Spd RWD 4X4

NPR Truck 1991-2004 V8 5.7L 4 Spd RWD

NPR Truck 2005-2010 V8 6.0L Gas 4 Spd RWD

XJS 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.


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