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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Automatic Transmission - 4T65-E - Repair Instructions - Off Vehicle) >> Repair Instructions - Off Vehicle >> Forward Band Servo Assemble

Forward Band Servo Assemble

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Locating Inspection Areas On Forward Band Servo
    GM678333Courtesy of GENERAL MOTORS CORP.
  1. Inspect the forward band servo components for the following conditions:
    • Damaged, worn or porous servo piston (16)
    • Damaged servo piston oil seal ring (18)
    • Damaged, worn or porous servo cover (13)
    • Damaged servo cover seal (14)
    • Broken or collapsed servo piston return spring (22)
    • Broken or collapsed servo piston cushion inner spring (65)
    • Broken or collapsed servo piston cushion outer spring (19)
    • Damaged or worn servo piston apply pin (21)
    2. Fig 2: Identifying Servo Piston & Components
    GM678332Courtesy of GENERAL MOTORS CORP.
  2. Assemble the servo piston (16), the servo piston cushion outer spring (19), the servo piston cushion inner spring (65), the servo cushion spring retainer (20) and the servo piston apply pin (21).
  3. Install the servo pin retaining ring (15) onto the servo piston apply pin (21).
  4. Install the servo piston oil seal ring (18) onto the servo piston (16).
  5. Assemble the 69.44 mm (2.73 in) servo piston return spring (22) onto the servo assembly.
    6. Fig 3: View Of Servo Assembly
    GM48181Courtesy of GENERAL MOTORS CORP.
  6. Install the servo cover seal (14) onto the servo cover (13).
  7. Assemble the servo assembly (15-22) into the servo cover (13). Pivot the servo assembly (15-22) into the servo cover (13) in order to prevent the piston oil seal ring from being damaged.
  8. Install the servo and cover assembly (13-22) into the case.
    9. CAUTION: Refer to Fastener Caution .
  9. Install the 3 forward band servo cover bolts (12) and tighten to 12 N.m (106 lb in).
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