The transparent design of CLEARGEARZ Differential covers not only looks cool when installed, but it allows you to inspect the differential gear for fluid levels, abnormal wear and water or foreign material that could cause bearing or ring gear wear, which will shorten rear end life. - Sight Glass Design lets you check Ring Gear Condition & Fluid Level. - Installs as easily as a stock cover. - Cleans with soap & water - Ideal for daily drivers or "show only" vehicles.