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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 219 (AUTOMATIC TRANSMISSION SERVICING)LUBRICATIONDRAINING & REFILLINGDRAINING
1999 GMC Forward Control 5.7 R, Automatic

Draining & Refilling: Draining

1999 GMC Forward Control 5.7 R, AutomaticSECTION Draining
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and support vehicle.
  2. Place a drain pan under the transmission oil pan.
  3. Remove the oil pan drain plug, if equipped.
  4. If necessary, remove the bolts and position aside the range selector cable bracket for clearance while lowering the pan. It is not necessary to remove the cable from the lever or bracket.
  5. Remove the oil pan bolts from the front and sides of the pan only.
  6. Loosen the rear oil pan bolts approximately 4 turns.
  7. Lightly tap the oil pan with a rubber mallet in order to loosen the pan to allow the fluid to drain.
  8. Remove the remaining oil pan bolts.
  9. Remove the oil pan and the gasket.
  10. Grasp firmly while pulling down with a twisting motion in order to remove the filter. See Fig 1.
  11. Remove the filter seal. The filter seal may be stuck in the pump; if necessary, carefully use pliers or another suitable tool to remove the seal.
  12. Discard the seal.
  13. Inspect the fluid color.
  14. Inspect the filter. Pry the metal crimping away from the top of the filter and pull apart. The filter may contain the following evidence for root cause diagnosis:
    • Clutch material.
    • Bronze slivers indicating bushing wear.
    • Steel particles.
  15. Clean the transmission case and the oil pan gasket surfaces with solvent, and air dry. You must remove all traces of the old gasket material.
Fig 1: Removing & Installing Filter & Seal
G00088348Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.