1998 GMC Safari Owner's Manual - Page 282

Automatic Transmission Fluid When to Check and Change How to Check Because this operationcan be a little difficult, may you choose to have done at your this GM dealership A good time to check your automatic transmission fluid Service Department. level is when the engine is changed. oil If you do it yourself, sure to follow all instructions be the Change both the fluid and filter every 15,000 miles here, or you could get false reading on the dipstick. a (25 000 km) if the vehicle is mainly driven under one or more of these conditions: e In heavy city traffic where the outside temperature NOTICE: regularly reaches 90°F (32°C) or higher. 0 In hilly or mountainous terrain. Uses such as found in taxi, police or delivery service. e When doing frequent trailer towing. If you do not use your vehicle under any of these conditions, change fluid and filter every the 50,000 miles (83 000 km). See "Scheduled Maintenande Services" in the Index. Too much or too little fluid can damage your transmission. Too much can mean that some of the fluid could come out and fall on hot engine parts or exhaust system parts, starting a Be fire. sure to get an accurate reading if you check your transmission fluid. 6-20