Tool Required

Printpartsummary
Symptoms:
  • Delayed engagement
  • Harsh shifts
  • Low line rise
  • No TV control
  • Slide shifts
  • Uncontrollable shift timing
  • Worn cases
Cause:

The continuous oscillation of the modulator valve wears the case bore, allowing oil circuit leakage.

Correction:

This oversized modulator valve re-establishes the integrity of the circuit, preventing oil circuit leakage.

Tool Required

A4LD, C3

Oversized Modulator Valve Kit

Part No.

56833-01K

A4LD, C3

Oversized Modulator Valve Kit

Part No. 56833-01K

  • Valve
  • Adjustment Screw

Complaint:

  • Delayed engagement
  • Harsh shifts
  • Low line rise
  • No TV control
  • Slide shifts
  • Uncontrollable shift timing
  • Worn cases

Cause:

The continuous oscillation of the modulator valve wears the case bore, allowing oil circuit leakage.


Correction:

This oversized modulator valve re-establishes the integrity of the circuit, preventing oil circuit leakage.

The continuous oscillation of the modulator valve wears the case bore, allowing oil circuit leakage. Line pressure and modulated TV pressure can cross leak or go to exhaust, resulting in uncontrollable shift timing, delayed egagements, harsh or slide shifts, poor line rise, and/or no TV control. Sonnax offers an oversized modulator valve kit 56833-01K that restores thehydraulic integrity of the circuits. Reamer kit 56833-TL must be used to accommodate the oversized valve.

  • Valve is manufactured from hard-coat anodized aluminum to prevent wear.
  • A longer modulator adjustment screw is included to properly preload the modulator spring and compensate for the oversized valve.
NOTE:

A modulator with an adjustment screw must be used with this oversized valve.

Required Tools

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Contact a Sonnax Distributor to purchase this part.