GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1997 🢒 GMC Suburban - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L80-E 🢒 Transmission Fluid Pump Assemble

Tools Required

    • J 21368 Alignment Band
    • J 38739 Oil Pump Seal Ring Installer
    • J 36850 TRANSJEL™

    Object Number: 31212 Size: SH
  1. Assemble the oil pump cover (206) and the oil pump body (203).

    2. Object Number: 31213 Size: SH

    Important : The round end on the splash shield fits into the hole in the oil pump cover. The slotted hole in the splash shield fits under the bolt head.

  2. Install the vent passage splash shield (239).
  3. Install the remaining oil pump cover bolts (220). Tighten the bolts with your fingers.

    4. Object Number: 31217 Size: SH
  4. Install an oil pump to case bolt (3) into the oil pump bolt hole.

    5. Important: The outside diameter of the oil pump body and oil pump cover must be properly aligned and then the alignment band can be tightened. This ensures that the oil pump will fit into the transmission case opening and maintains maximum oil pump efficiency.

  5. Install J 21368 onto the transmission oil pump assembly and tighten.
  6. Install the five oil pump cover bolts (220).

    7. Tighten
    Tighten the bolts to 24 N·m (18 lb ft).

  7. Remove the J 21368 and the pump to case bolt (3).

    8. Object Number: 31219 Size: SH

    Important: Coat the oil pump O-ring seal with J 36850 or equivalent. This will ease assembly and prevent damage to the seal.

  8. Install the transmission oil pump O-ring seal (5).

    9. Object Number: 31221 Size: SH
  9. Set the J 38739 Installer to position #1.
  10. Install the J 38739 Installer on the oil pump hub.
  11. Place a seal (219) onto the J 38739 Installer.
  12. Push the seal into the seal groove with the J 38739 Pusher.
  13. Remove the tools.

    14. Object Number: 31224 Size: SH
  14. Place the small bevel end of the J 38739 Sizer over the seal (219).
  15. Leave the J 38739 Sizer in place for at least one minute in order to allow the oil seal to return to the proper size.
  16. Use J 36850 or equivalent in order to keep the seals in place.
  17. Remove the J 38739 Sizer.

    18. Object Number: 31221 Size: SH
  18. Set the J 38739 Installer to position #2.
  19. Install the J 38739 Installer on the oil pump hub.
  20. Place a seal (219) onto the J 38739 Installer.
  21. Push the seal (219) into the seal groove with the J 38739 Pusher.
  22. Remove the tools.

    23. Object Number: 40710 Size: SH
  23. Place the large bevel end of the J 38739 Sizer over the seal (219).
  24. Leave the J 38739 Sizer in place for at least one minute in order to allow the oil seal to return to the proper size.
  25. Use J 36850 or equivalent in order to keep the seals in place.
  26. Remove the J 38739 Sizer.