Symptoms:

  • No kickdown
  • Stacked shifts
  • Poor line pressure control
  • High line pressure in Reverse
  • Direct clutch failure
  • Worn cases

Cause:

Persistent oscillation of steel OE modulator valve within case bore creates excess wear that results in driveability concerns.

Correction:

Recover hydraulic control and restore the case by reconditioning the bore and installing Sonnax oversized modulator valve kit.

C6

Oversized Modulator Valve Kit
Part No. 36833-01K


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

Vehicles with Ford C6 transmissions often display stacked upshifts, no kick-down, little or no line rise and/or direct clutch failure. These concerns are frequently caused by wear of the transmission case at the modulator valve bore due to continuous oscillation of the steel valve within the bore. As wear progresses, line pressure and TV pressure are allowed to cross-leak or exhaust, resulting in these driveability problems. Salvage the case and restore normal shift operation by reconditioning the bore and installing Sonnax oversized modulator valve kit 36833-01K.

Appropriate springs included for gas, diesel and gas/diesel conversions.

ApplicationSonnax Spring
Standard Gas Yellow Spring
Diesel Pink Spring
Gas Governor or Valve Body in Diesel Application Pink Spring
  • Valve
  • Spring, Yellow Standard Gas
  • Spring, Pink Gas/Diesel Conversion
  • C6 Oversized Modulator Valve Kit 36833-01K
  • C6 Oversized Modulator Valve Kit 36833-01K

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

C6 Oversized Modulator Valve Kit Vacuum Test Locations