1994 GMC Suburban Owner's Manual - Page 274

To remove the air cleaner filter on a gas engine ora 6.5 liter naturally aspirated diesel, turn the wing nuts to the left. Remove the cover and change the filter. To remove the air cleaner filter on a 6.5 liter turbocharged diesel, first remove the rubber elbow. Remember to observe the caution about turbocharger blades on the rubber elbow. Then, unhook the cover retaining clips and push the rear of the cover toward the engine. A utomafic Transmission Fluid When to Check and Change A good time to check your automatic transmission fluid level is when the engine oil is changed. Refer to the Maintenance Schedule to determine when to change your fluid. See "Scheduled Maintenance Services" in the Index. How to Check Because this operation can be a little difficult, you may choose to have this done at a GM dealership Service Department. If you do it yourself, be sure to follow all the instructions here, or you could get a false reading on the dipstick. 6-28