Please check notes in each part listing to ensure the Axle Shaft Seal is correct for your 2006 CADILLAC STS with a 3.6L engine. NATIONAL & ACDELCO are competing brands, and each brand's Axle Shaft Seal may be interchangeable. Special restrictions like "California only" or "with sport package" may indicate a Axle Shaft Seal fits only certain 2006 CADILLAC STS models.
Clicking a "More Info" link will display a picture and/or other details about that Axle Shaft Seal in a separate window (you may need to turn off your pop-up-blocking software for this to work).
After choosing a Axle Shaft Seal, click the "Add Part" button. Shipping costs will be shown on the Shopping Cart page. You may use your browser's Back button or click "Find More Parts" to find more Drivetrain parts, other CADILLAC STS parts or parts for a different vehicle. Please try our Interactive Catalog (click link above) for faster searching. Both catalogs use the same shopping cart so any auto parts you've already chosen for your 2006 CADILLAC will not be lost if you switch.