Sonnax 34200-10K, 4L80E / 4L85E Boost Valve Kit

$ 107.00

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SKU: SX 34200-10K, a18 rb b7 Categories: , Tags: , ,

Description

4L80E / 4L85E Boost Valve Kit, Sonnax 34200-10K. 

With encapsulated relief valve. O-Ring style

Common problems in vehicles with GM 4L80-E and 4L85-E transmissions include uncontrollable line rise (upward of 500 psi), high line pressure in Reverse, broken direct clutch drums and/or broken cases. These problems can be caused by excessive EPC torque signal pressure. Sonnax self-regulating boost valve kit 34200-10K eliminates these problems by limiting EPC pressure.

  • Hardened steel boost valve has an encapsulated relief valve that will allow EPC pressure to exhaust if it exceeds 95-105 psi
  • Boost valve with 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
  • Closely toleranced sleeve restores the hydraulic integrity between the valve and sleeve
  • O-Rings have been added to the sleeve to provide a positive seal that compensates for pump bore wear
  • Drop-in Zip Valve parts install quickly and easily

  • Valve
  • Sleeve
  • O-Rings (2)

Symptoms:

  • Uncontrollable line rise
  • High line pressure
  • Broken parts
  • Broken clutch piston

Cause:

Unregulated EPC pressure forces pressure regulator into high line position.

Correction:

This self-regulating Reverse boost valve regulates EPC pressure to 95–105 psi with the Sonnax drop-in encapsulated relief valve.

Additional information

Weight 1 lbs
Dimensions 4 × 4 × 2 in