Symptoms:

  • Delayed engagement
  • Poor shift quality
  • Low line pressure
  • High line pressure
  • Overheating
  • Low cooler flow at idle

Cause:

Wear at the inboard end of the PR valve reduces force, which affects converter feed and engagements, also creating higher line pressure. Wear at the mid-outer end reduces line pressure as it leaks to sump.

Correction:

The Sonnax kits contain a highly wear resistant aluminum sleeve to fit with the OE anodized aluminum valve, providing additional support and proper line pressure control.

4R44E, 4R55E, 5R44E, 5R55E

Pressure Regulator Sleeve Kit
Part No. 37947-05K


You need this if... View Instructions Find a Distributor

Constant oscillation of the pressure regulator valve can cause excessive wear at the balance line end of the bore, allowing balance line pressure to exhaust and preventing the pressure regulator valve from stroking to the lower line pressure position. Severe wear prevents line from entering the converter apply circuit, which will also restrict valuable cooler flow. Sonnax pressure regulator sleeve kit 37947-05K mates with the OE anodized aluminum valve or optional Sonnax pressure regulator valve 37947-54. Use of this sleeve allows the valve bore to be oversized, and the hydraulic integrity of the bore to be restored.

  • Specially toleranced alloy aluminum sleeve is significantly more wear-resistant than the cast -aluminum valve body, and provides more contact surface with the valve for increased stability and durability.
  • Kit includes a replacement solenoid regulator valve spring, which is often damaged during valve body disassembly.
  • The tool kit 37947-TL5 also works for Sonnax TCC modulator sleeve kit 37947-07K
  • Sleeve
  • Retaining Clip
  • Spring (For solenoid regulator valve)
  • 4R44E, 4R55E, 5R44E, 5R55E Pressure Regulator Sleeve Kit 37947-05K
  • 4R44E, 4R55E, 5R44E, 5R55E Pressure Regulator Sleeve Kit 37947-05K

You need this if...

4R44E, 4R55E, 5R44E, 5R55E Pressure Regulator Sleeve Kit Vacuum Test Locations