2007 GMC Envoy Owner's Manual - Page 429

How to Check Lubricant To get an accurate reading, the vehicle should be on a level surface. Front Axle When to Check Lubricant It is not necessary to regularly check front axle fluid unless you suspect there is a leak or you hear an unusual noise. A fluid loss could indicate a problem. Have it inspected and repaired. How to Check Lubricant If the level is below the bottom of the filler plug hole, you'll need to add some lubricant. Add enough lubricant to raise the level to the bottom of the filler plug hole. Use care not to overtighten the plug. What to Use To determine what kind of lubricant to use, see Recommended Fluids and Lubricants on page 517. To get an accurate reading, the vehicle should be on a level surface. 429