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Checking Fluid Level: 4T40-E

  1. Fluid level must be checked at temperature of 104°F (40°C). To obtain proper temperature:
    • 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 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 124 INCH 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.