GM Service Manual Online
For 1990-2009 cars only

When to Check Lubricant

It is not necessary to regularly check rear 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


Object Number: 809097  Size: B3

To get an accurate reading, the vehicle should be on a level surface.

The proper level is from 5/8 inch to 1 5/8 inch (15 mm to 40 mm) below the bottom of the filler plug hole. Add only enough fluid to reach the proper level.

What to Use

To determine what kind of lubricant to use, see Recommended Fluids and Lubricants .

When to Check Lubricant

It is not necessary to regularly check rear 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

1500 Series shown, 2500 similar


Object Number: 809097  Size: B3

To get an accurate reading, the vehicle should be on a level surface.

    • The proper level for the 1500 Series is from 5/8 inch to 1 5/8 inch (15 mm to 40 mm) below the bottom of the filler plug hole.
    • The proper level for the 2500 Series is from 0 to 1/2 inch (0 to 13 mm) below the bottom of the filler plug hole.
    •  The proper level for the 1500 and 2500 series vehicles with QUADRASTEER (4-Wheel Steer) is from 0 to 1/4 inch (0 to 6 mm) below the filler plug hole.

Add only enough fluid to reach the proper level.

What to Use

To determine what kind of lubricant to use, see Recommended Fluids and Lubricants .