Tool Required VB-FIX Required
- Delayed engagement
- Erratic buzz
- High line pressure in Reverse
- Low line rise
- Soft shifts
- Uncontrolled pressure in Reverse
Wear at the pressure regulator valve bore allows vital main line pressure to exhaust and reduces converter charge pressure
Refurbish the valve bore and install the Sonnax oversized valve and spring to restore proper hydraulic function and prevent future wear.
Oversized Pressure Regulator Valve Kit
As the valve bore wears at the inboard spool, line pressure escalates with increased temperature and the pressure regulator valve does not stroke, reducing converter charge. As line pressure goes up, servo covers and pistons have excess pressure in reverse. Delayed engagements occur as the converter feed is reduced with excess bore wear. Line pressure will be reduced as the circuits between line, converter and exhaust wear. The Sonnax pressure regulator valve kit 56947J-39K can restore proper hydraulic function and prevent future wear.
- Hard-coat anodized aluminum valve prevents wear and has modified spool length to maintain OE pressure curve
- Includes replacement spring to restore OE pressures with oversized valve