Symptoms:

  • 2-4 Band burned
  • 4th Band servo piston breakage
  • 1-2 Quality poor
  • No 4th
  • 4th Slip
  • 3-4 Concerns

Cause:

The overdrive servo piston cracks, allowing apply oil to leak. In addition, the OE servo cover bolts are not hard enough, which causes the cover to come loose, allowing the piston to cock and break.

Correction:

The Sonnax overdrive servo piston is made from stronger materials to prevent cracking, while the hardened bolts included in the kit prevent the cover from coming loose.
  • JR403E Overdrive Servo Piston Kit 62170-01K
  • JR403E Overdrive Servo Piston Kit 62170-01K