OVERSIZE P/REGULATOR VALVE KIT GEN II
# 99789K

Oversize Pressure Regulator Valve Kit

OVERSIZE P/REGULATOR VALVE KIT GEN II

ZF valve name: SYS.DR-V. Tool Required.

Symptoms:

  • Poor shift quality
  • Low line pressure
  • Flare shifts
  • High line pressure
  • Harsh shifts
  • Burnt converter
  • Delayed Reverse
  • No Reverse
  • TCC slip

Cause:
Pressure regulator bore wear allows fluid loss that causes erratic line pressure and poor drivability.

Correction:
Recover pressure control and renew shift quality by reconditioning the bore and installing Sonnax oversized pressure regulator valve kit.


In ZF6HP21/28/34 (Gen. 2) valve bodies, wear is commonly found at different areas in the pressure regulator bore. Wear at the balance end causes high pressure spikes leading to broken drums, pistons or other parts and wear at the spring end of the bore allows low line pressure and lube/TC fluid to exhaust, leading to burnt converter clutches and premature bushing failure. The Sonnax oversized pressure regulator valve kit restores valve-to-bore clearances to maintain correct pressures.

  • Valve is hardcoat anodized to resist wear
  • Sleeve is made from highly wear-resistant aluminum

Note:
Kit is NOT compatible with ZF6HP19/26/32 (Gen.1) units. 


Contents:

  • Valve
  • Sleeve

SONNAX Installation Instructions

Type of Product: Sundry Parts
Qty Needed:
Years:
Alternative #:
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