Checking Fluid Level: 4T40-E

Fluid level must be checked with transmission fluid at normal operating temperature. To obtain proper temperature, do the following:
- Idle vehicle for 3-5 minutes.
- Shift into each gear position, holding in each position for 3 seconds.
Place gear selector in "P" position. Leave engine running. 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 Oil Check Plug (4T40-E)
Courtesy of GENERAL MOTORS CORP.
Oil level should be level with bottom of oil check plug hole. If fluid does not drain from hole, add appropriate fluid until fluid starts to pour from hole. See RECOMMENDED FLUID . Tighten oil check plug to 124 INCH lbs. (14.0 N.m).