GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1997 🢒 Century 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T65-E 🢒 Control Valve Body Replacement

Removal Procedure
  1. Remove the case side cover. Refer to Control Valve Body Cover Replacement .
  2. Remove the oil pump. Refer to Oil Pump Replacement .

    3. Object Number: 164796 Size: LH
  3. Remove the valve body bolts.

    4. Object Number: 48225 Size: SH
  4. Remove the valve body while keeping the spacer plate with the transaxle.

    5. Object Number: 49399 Size: SH
  5. Remove the ball check valves from the valve body.

    6. Object Number: 49396 Size: SH
  6. Remove the spacer plate and gasket.

    7. Object Number: 48229 Size: SH
  7. Remove the ball check valves from the case cover.

    8. Object Number: 12988 Size: SH
  8. Inspect each check valve seat for excessive peening. Place a ball check valve on each seat and use a flashlight in order to look for visible light between the valve and the seat.
  9. Inspect all components removed from the transaxle. Refer to the Transmission/Transaxle/Transfer Case Unit Repair Manual.

Installation Procedure

Tool Required

J 36850 TRANSJEL™

    Notice: Do NOT use any type of grease to retain parts during the assembly of this unit. Using greases other than the recommended assembly lube changes the transaxle fluid characteristics. Using greases other than the recommended assembly lube causes undesirable shift conditions and/or filter clogging. Use TRANSJEL™ J 36850 or equivalent during the assembly of this unit.


    Object Number: 48229 Size: SH
  1. Install the ball check valves into the case cover. Use the J 36850 to retain the ball check valves in their proper locations.

    2. Object Number: 49396 Size: SH
  2. Install the spacer plate and the gasket.

    3. Object Number: 49399 Size: SH
  3. Install the ball check valves into the valve body. Use the J 36850 to retain the ball check valves in their proper locations.

    4. Object Number: 48225 Size: SH

    Important: Do NOT use impact type tools on the valve body or on the oil pump.

  4. Install the valve body and the gasket.

    5. Object Number: 164796 Size: LH
  5. Install the valve body bolts.

    6. Tighten

        • Tighten the M6 X 1.0 X 20 bolt and/or screw to 8 N·m (70 lb in).
        • Tighten the M6 X 1.0 X 30 bolt and/or screw to 12 N·m (106 lb in).
        • Tighten the M6 X 1.0 X 45 bolt and/or screw to 12 N·m (106 lb in).
        • Tighten the M6 X 1.0 X 55 bolt and/or screw to 11 N·m (97 lb in).
        • Tighten the M6 X 1.0 X 60 bolt and/or screw to 12 N·m (106 lb in).
        • Tighten the M6 X 1.0 X 65 bolt and/or screw to 12 N·m (106 lb in).
        • Tighten the M6 X 1.0 X 85 bolt and/or screw to 11 N·m (97 lb in).
        • Tighten the M6 X 1.0 X 90 bolt and/or screw to 11 N·m (97 lb in).
        • Tighten the M8 X 1.0 X 90 bolt and/or screw to 25 N·m (18 lb ft).

    Important: Do NOT use impact type tools on the valve body or on the oil pump.

  6. Install the oil pump. Refer to Oil Pump Replacement .
  7. Install the case side cover. Refer to Control Valve Body Cover Replacement .