1996 GMC Safari Owner's Manual - Page 251

How to Check Because this operation can be a little difficult, you may choose to have this done at your GM dealer Service Department. Wait at least 30 minutes before checking the transmission fluid level if you have been driving: When outside temperatures are above 90°F (32°C). At high speed for quite a while. 0 If you do it yourself, be sure to follow all the instructions here, or you could get a false reading on the dipstick. In heavy traffic -- especially in hot weather. While pulling a trailer. NOTICE: Too much or too little fluid can damage your transmission. Too much can mean that some of on the fluid could come out and fall hot engine parts or exhaust systemparts, starting a fire. Be sure to get an accurate reading if you check your transmission fluid. To get the right reading, the fluid should be at normal operating temperature, which is 180°F to 200°F (82°C to 93°C). Checking Transmission FluidHot Get the vehicle warmed up by driving about 15 miles (24 km) when outside temperatures are above 50°F (10°C). If it's colder than 50°F (lO"C), drive the vehicle in DRIVE (D) until the engine temperaturegage moves and then remains steady for 10 minutes. Then follow the hot check procedures. 6-21