2013 Chevrolet Tahoe Owner Manual - Page 366

10-26 Vehicle Care What to Use Refer to Recommended Fluids and Lubricants on page 11‑12 to determine what kind of lubricant to use. heard. A fluid loss could indicate a problem. Have it inspected and repaired. How to Check Lubricant To get an accurate reading, the vehicle should be on a level surface. Rear Axle When to Check Lubricant It is not necessary to regularly check rear axle fluid unless there is a leak suspected, or an unusual noise is heard. A fluid loss could indicate a problem. Have it inspected and repaired. All axle assemblies are filled by volume of fluid during production. They are not filled to reach a certain level. When checking the fluid level on any axle, variations in the readings can be caused by factory fill differences between the minimum and the maximum fluid volume. Also, if a vehicle has just been driven before checking the fluid level, it may appear lower than normal because fluid has traveled All Except 1500 Series A. Fill Plug B. Drain Plug . 1500 Series A. Fill Plug B. Drain Plug . When the differential is cold, add enough lubricant to raise the level from 0 mm (0 in) to 3.2 mm (1/8 in) below the fill plug (A) hole. When the differential is at operating temperature (warm), add enough lubricant to raise the level to the bottom of the fill plug (A) hole.