GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Generic 🢒 1998 🢒 Unit Repair 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T80-E 🢒 Control Valve Lower Body Assemble

    Object Number: 15475 Size: SH
  1. Inspect the lower control valve body (903) for scratches or debris in the valve bores.
  2. Inspect the mating surfaces for damage.
  3. Inspect the servo bore for damage.
  4. Inspect all fluid passages for debris.

    5. Object Number: 15473 Size: SH
  5. Attach the manual valve link and clip (915) to the manual valve (916). Install the manual valve and link into the lower control valve body.

    6. Object Number: 15472 Size: SH
  6. Install the following parts:
    7. • The forward orifice bypass valve (924)
    • The forward orifice bypass valve spring (925)
    • The coiled spring flag pin (926)

    Object Number: 15469 Size: SH
  7. Install the following parts:
    8. • The 2-3 shift valve spring (906)
    • The 2-3 C shift valve (907)
    • The 2-3 D shift valve (908)
    • The 2-3 shift solenoid valve (909)
    • The 2-3 shift solenoid valve retainer clip (308)

    Object Number: 15468 Size: SH
  8. Install the solenoid screen assembly (917).

    9. Object Number: 15467 Size: SH
  9. Install the following parts:
    10. • The 1-2 shift valve spring (918)
    • The 1-2 A shift valve (919)
    • The 1-2 B shift valve (920)
    • The 1-2 shift solenoid valve (909)
    • The 1-2 shift solenoid valve retainer clip (308)

    Object Number: 15465 Size: SH
  10. Install the following parts:
    11. • The 3-4 shift valve spring (911)
    • The 3-4 shift valve (912)
    • The bore plug (914)
    • The bore plug retainer clip (308)

    Object Number: 15464 Size: SH
  11. Install the following parts:
    12. • The reverse orifice bypass valve (921)
    • The reverse orifice bypass valve spring (922)
    • The coiled spring flag pin (923)

    Object Number: 15462 Size: SH
  12. Install the following parts:
    13. • The ball (979)
    • The ball check capsule (905)
    • The spring retainer (904)

    Object Number: 15460 Size: SH
  13. Install the washer (933) and the sleeve (980) onto the servo pin (931).
  14. Install the servo cushion spring (934) in the servo piston (928).
  15. Then install the pin (931) into the piston and install the retaining ring (902) onto the servo pin.
  16. Place the return spring (901) into the servo bore.
  17. Place new seals (929, 930) on the servo piston (929), and install the piston and pin assembly into the servo bore. Attach the retaining ring (932) to the pin.

    18. Object Number: 15477 Size: SH
  18. Install the checkballs (5, 7, 8, 9) into the lower control valve body (903). Retain the checkballs in position with Transjel™.