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Low-Reverse Servo: Installation

  1. For testing purposes, install a A4LD Servo Piston Return Spring (D4ZZ-7D031-A ), with original return spring, servo piston and rod. Install Servo Rod Selecting Gauge (49 UN01 016 ) and tighten bolts to 10 ft. lbs. (14 N.m).
  2. Tighten servo gauge adjusting screw to 35 INCH Lbs. (4 N.m). Install dial indicator with tip on servo piston pad. See Fig 1 . Set dial indicator to zero. Back out servo gauge adjusting screw completely.
  3. Read dial indicator measurement. If measurement is .120-.220" (3.0-5.6 mm), go to next step. If measurement is less than, .120" (3 mm), use next shorter size rod. See SERVO PISTON ROD LENGTH IDENTIFICATION  table. If measurement is more than .220" (5.6 mm), use next size longer rod.
    Fig 1: Measuring Low-Reverse Servo Rod Length
    G98J01928Courtesy of FORD MOTOR CO.
    SERVO PISTON ROD LENGTH IDENTIFICATION

    Markings (1) In. (mm)
    1 Groove 2.085-2.112 (53-54)
    No Groove 1.986-2.014 (50-51)
    2 Grooves 1.888-1.915 (48-49)
    (1) Identify rod length by number of grooves located on servo piston rod shaft.
  4. Remove dial indicator, servo gauge, servo piston, rod, return spring and additional test spring. Install selected servo rod, return spring and piston. Install new separator plate and cover gasket. Install servo cover and tighten bolts in a crisscross pattern to specification. See TORQUE SPECIFICATIONS  .
  5. To complete installation, reverse removal procedure. See TORQUE SPECIFICATIONS  . Add 3 qts. (2.8L) of ATF and start engine. Add fluid as necessary.
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