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Symptoms:

  • Repeated case breakage
  • Gear ratio codes
  • TCC codes
  • High line pressure in Reverse
  • Low pressure
  • Delayed engagement

Cause:

Wear at the pressure regulator bore, especially at the balance end, results inthe PR valve not being able to stroke to the lower line pressure position. This results in high line pressure. Leakage of line to exhaust reduces line rise. Slow line rise in response to engine load eventually burns a clutch or reduces TCC apply pressure.

Correction:

Refurbish worn bores using the specially designed F series tool kit and the Sonnax VB- FIX and install the Sonnax oversized Pressure Regulator valve and boost valve assembly

4T80-E

Oversized Pressure Regulator & Boost Valve Kit
Part No. 72754-03K

1994 & later


You need this if... View Instructions
  • Hard-coat anodized aluminum valve.
  • New boost valve is calibrated to work with OS pressure regulator valve.

Reamer kit F-72754-TL3 is no longer in production but may be available from distributor inventory.

  • Spring
  • Pressure Regulator Valve
  • Boost Valve
  • Boost Sleeve
  • 72754 03k combo
  • 72754 03k

You need this if...

Wear is identified by visual inspection or vacuum testing

  • 72754 03k test