1997 GMC Suburban Owner's Manual - Page 304

Checking the Fluid Hot or Cold 0 Then, without shuttingoff the engine, follow these steps: Park your vehicle on a level place. Keep the engine running. With the parking brake applied, place the shift lever in PARK (P). With your foot on the brake pedal, move the shift lever through each gear range, pausing for about three seconds in each range. Then, position the shift lever in PARK (P). 0 0 Let the engine run at idle for threeminutes or more. 1. The red transmission dipstick is located at the rearof the enginecompartment, on the passenger's side. Flip the handle up and then pull out dipstick and the wipe it with a clean rag or paper towel. 2. Push it back in all the way, wait three seconds and then pull itback out again. 6-22