Tool Required

Printpartsummary
Symptoms:
  • 3-4 Clutch failure
  • Clutch slippage
  • Excess pump noise
  • Low line rise
  • Reverse chatter
Cause:

Pressure regulator valve bore wear allows leakage and contributes to erratic pump slide movement.

Correction:

Repair the valve bore and restore pressure control to the system with this oversized pressure regulator valve and reamer kit.

Tool Required

200-4R, 4L60

Oversized Pressure Regulator Valve

Part No.

77917-06

Oversized Pressure Regulator Valve
  • 77917-06_combo

  • Oversized Pressure Regulator Valve

Small_77917-06_combo Small_77917-06

200-4R, 4L60

Oversized Pressure Regulator Valve

Part No. 77917-06

Complaint:

  • 3-4 Clutch failure
  • Clutch slippage
  • Excess pump noise
  • Low line rise
  • Reverse chatter

Cause:

Pressure regulator valve bore wear allows leakage and contributes to erratic pump slide movement.


Correction:

Repair the valve bore and restore pressure control to the system with this oversized pressure regulator valve and reamer kit.

A worn OE pressure regulator valve can be detected in two ways. The first is a dynamometer test that reveals low line pressure during boost conditions (look for 50-100 psi less than specified in Reverse). The second is vehicle symptoms such as clutch slippage, reverse chatter and 3-4 clutch failure. Any of the above problems indicate bore wear that should be addressed.

To address pressure regulator leakage in GM 4L60, 200-4R pump covers, Sonnax offers oversized pressure regulator valve 77917-06. The Sonnax valve permits pump covers to be restored to OE specifications by correcting for wear and leakage at the pressure regulator valve.

  • Refurbish the pump cover by reaming the bore and installing an oversized pressure regulator valve
  • The pressure regulator valve helps restore control over the pressure regulating circuit by eliminating leakage
NOTE:

Boost valves should be checked for leakage at the same time the pressure regulator valve is being replaced.

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