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Reverse Servo Assembly: Installation

NOTE: This is not an ordinary installation procedure and does not compensate for band wear.
NOTE: Lubricate the reverse piston seal with clean automatic transmission fluid to facilitate assembly and prevent damage to the seal.
  1. Install the reverse servo return spring and piston.
    • Do not install the piston cover.
      Fig 1: Installing Reverse Servo Return Spring And Piston
      G04706117Courtesy of FORD MOTOR CO.
  2. Install the special tool and tighten the band apply bolt.
    • Tighten to 5.6 Nm (50 lb-in).
      Fig 2: Identifying Special Tool (307-073)
      G04706118Courtesy of FORD MOTOR CO.
  3. Attach the special tool to the transmission.
    • Position the indicator stem on the flat portion of the reverse servo piston and zero the dial indicator.
      Fig 3: Attaching Special Tools (307-073) And (100-002) To Transmission
      G04706119Courtesy of FORD MOTOR CO.
  4. Loosen the bolt until the piston stops against the tool.
    Fig 4: Loosening Bolt
    G04706120Courtesy of FORD MOTOR CO.
  5. Verify the amount of piston travel on the dial indicator is within specification.
    Fig 5: Identifying Dial Indicator
    G04706121Courtesy of FORD MOTOR CO.
  6. If piston travel is not within specification, select and install the correct servo piston assembly to bring the servo piston travel within specification.
    1. One groove
    2. Two groove
    3. Three groove
      Fig 6: Identifying Servo Piston Travel Specification
      G04706122Courtesy of FORD MOTOR CO.
  7. Remove the dial indicator and servo selection tool.
    Fig 7: Locating Dial Indicator And Servo Selection Tool
    G04706123Courtesy of FORD MOTOR CO.
  8. Install the correct reverse servo assembly.
    1. Install the reverse band servo spring.
    2. Install the reverse band servo piston and rod.
    3. Install the reverse band servo cover.
      Fig 8: Identifying Reverse Band Servo Piston And Rod
      G04706124Courtesy of FORD MOTOR CO.
  9. Using the special tool, install the reverse servo retaining ring.
    1. Compress the servo spring.
    2. Install the reverse band servo retaining ring.
      Fig 9: Identifying Special Tool (307-251)
      G04706125Courtesy of FORD MOTOR CO.
  10. Install the main control valve body. For additional information, refer to MAIN CONTROL VALVE BODY  in this article.
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