The meeting of two heavy metallic parts can get a little rough around the edges. When it comes to your extension housing, you'll want a soft seal between it and your transfer case. If your stock automatic transmission extension housing seal is starting to show its age, swap it out with a brand new part from AutoAnything. Each and every automatic transmission extension housing seal on our site meets or beats factory specs, and we guarantee the lowest price on your new part. On top of that, you get free shipping.