It's advised to replace this when you replace your clutch assembly as a regular maintenance part. This is the 'upgraded' slave cylinder that came factory for the 01-02 f-body's, and is an upgrade for 98-00 f-body's.
These slave cylinders are designed to transfer fluid for your throwout bearing aiding in easy pedal pressure. These slave cylinders are great stock replacements and made with all the quality you've come to expect. We buy these in bulk from the same company GM does, and pass along the savings. Includes new throwout bearing.