Accessories

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

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.

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. The Sonnax reduced force servo return spring 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

Note:
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.

SONNAX Installation Instructions