1996 GMC Sonoma Owner's Manual - Page 310

I Short TripKity Maintenance Schedule I Lfyou do not use y o ~ l r vehicle under any of 50.000 A Yes (83 000 km) 0Change automatic transmission fluid and filter if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90 O F (32°C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. these conditions,the fluid and filter do not require changing. Manual transmission fluid doesn't require change. I I I DATE ACTUAL MILEAGE SERVICED B Y 7-18