1998 Chevrolet Lumina BaseFACTORY OEM SERVICE PROCEDURE

4T40-E & 4T45-E

  1. Fluid level must be checked at temperature of 104°F (40°C). To obtain proper temperature, perform the following:
    • Idle vehicle for 3-5 minutes.
    • Shift into each gear position, holding in each position for 3 seconds.
  2. Place gear selector in Park. Raise and support vehicle. Place oil drain pan below oil check plug. Oil check plug is located in center of transaxle above pan rail, on torque converter side. See Fig 1. Remove oil check plug.
    Fig 1: Locating 4T40-E & 4T45-E Oil Check Plug
    G95B13699Courtesy of GENERAL MOTORS CORP.
  3. Oil level should be at bottom of oil check plug hole. If fluid does not drain from hole, add fluid until fluid starts to pour from hole. Tighten oil check plug to 10 ft. lbs. (14 N.m).
CAUTION: DO NOT overfill transmission. When transmission is hot, one pint of fluid will raise fluid level from ADD 1 PT. or .5L mark to FULL HOT mark on dipstick.
Factory Service Tools

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When to See a Mechanic

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.

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