1997 GMC Sonoma Owner's Manual - Page 258

How to Add Fluid Refer to the Maintenance Schedule to determine what kind of transmission fluid to use. See "Recommended Fluids and Lubricants" in the Index. Add fluid only after checkingthe transmission fluid HOT. (A COLD check is used only as a reference.) If the fluid level is low, add only enoughof the proper fluid to bring the level up to the HOT area for a hot check. T doesn't t take much fluid, generally lessthan one pint (0.5 L). Don 't overjill. Manual Transmission Fluid When to Check A good time to have it checked is when the engine oil is changed. However, the fluid in your manual transmission doesn't require changing. How to Check Because this operation can be a little difficult, you may choose to have this done at your GM dealership Service Department. NOTICE: We recommend you use only fluid labeled DEXRON@-111,because fluid with that label is made especially for your automatic transmission. Damage caused by fluid other than DEXRON-111 is not covered by your new vehicle warranty. After adding fluid, recheck the fluid level as described under "How to Check." When the correct fluid level is obtained, push the dipstick back in all the way; then flip the handle down to lock the dipstick in place. If you do it yourself, be sure to follow all the instructions here, or you could get a falsereading. NOTICE: Too much ortoo little fluid can damage your of transmission. Too much can mean that some the fluid could come out fall on hot engine and parts or exhaust system parts, starting a fire. Be if you sure to get an accurate reading check your transmission fluid. 6-20