Symptoms:

  • 1-2 Soft
  • 3-4 Soft
  • 2-3 Flare

Cause:

The servo timing and apply rate of the direct clutch become poor due to low pressure, servo leakage and/or pin bore wear.

Correction:

Installation of Sonnax servo return spring will slow the release of the band on a 2-3, yet allow quicker servo travel on reapplication. This results in shorter shifts throughout.

CD4E, LA4A-EL

Servo Return Spring
Part No. 73708

Fits '94-'08 except applications with the shorter spring.

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In Ford CD4E and Mazda LA4A-EL units, low pressure, servo leakage and/or pin bore wear can all cause a degradation of the servo timing and apply rate of the direct clutch in CD4E transmissions. Sonnax reduced force servo return spring 73708 to addresses these problems.

  • Replacement spring provides enough force to firmly apply the 2-4 band, yet is not overly stiff so that a controlled release is allowed
  • Spring will work with both the one-piece or two-piece servo piston and rod assembly

This spring will shorten shift duration, but is not a fix for leakage, a weak pump or poor line rise. Always verify the hydraulics by testing line pressure first.

  • CD4E, LA4A-EL Servo Return Spring 73708
  • CD4E, LA4A-EL Servo Return Spring 73708 details