1998 GMC Safari Owner's Manual - Page 366

' Long Trip/Highway Maintenance Schedule 30,000 Miles (50 000 km) (Continued) 0 Lubricate chassis components (or every months, whichever occurs first). 12 (See footnote#.) 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals leaking. (See footnote**.) for L7 For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs fist). 0 Change automatic transmission fluid and if the vehicle is mainly driven filter under one or more these conditions: of - In heavy city traffic where the outside temperature regularly reaches 90°F (32OC) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. If you do not useyour vehicle under any these conditions, change the of fluid andfilter every 50,000 miles (83 000 km). 0 Rotate tires. See "Tire Inspection and Rotation" the Indexfor proper in rotation pattern and additional information. (See footnote +.) 0 Replace fuel filter. An Emission Control Service. (See footnote?.) 0 Replace air cleaner filter. An Emission Control Service. 7-32