Symptoms:

  • Delayed engagement
  • Lube failures
  • Converter bushing failure
  • Pressure regulator buzz

Cause:

Poor converter feed restricts oil flow to converter/lube circuit, but common aftermarket methods of drilling the valve body to improve lube aggravate existing converter drainback problems.

Correction:

Sonnax valve regulates lube to improve converter feed at low RPM and high throttle conditions while preventing drainback.

A727, A904

Lube Regulated Pressure Regulator Valve
Part No. 22771A-10K

Fits '62–'77 units.

View Instructions Find a Distributor

Under extreme pressure or temperature conditions, the converter/lube circuit in listed Chrysler RWD units can be restricted by the PR valve. The practice of drilling a hole between passages is problematic. This outdated technique contributes to slow engagements or — if the hole is improperly drilled — excessive converter pressure and low line pressure.

The best way to improve oil flow is to replace the OE valve with Sonnax lube regulator pressure regulator valve 22771A-10K, which ensures oil flow under extreme operating conditions and prevents drainback when the truck is off.

  • Improves converter feed/lube oil flow at critical low RPM and high load conditions
  • Redesigned valve prevents fluid drainback & slow engagements
  • Helps charge the converter in Park

No valve body modifications required.


  • A727, A904 Lube Regulated Pressure Regulator Valve 22771A-10K
  • A727, A904 Lube Regulated Pressure Regulator Valve 22771A-10K
  • A727, A904 Lube Regulated Pressure Regulator Valve 22771A-10K details