Allstar Blue Anodized Axle Housing Seal fits the Ford and measures 9 inches at the read end with 3 inch axle tubes. The seal measures 2. 500 inches o. d. for a 1/4 inch wall. It has a 3 inch tube and features a gold anodized finish. The internal seal prevents the gear lube from leaking into the axle tube. It keeps oil in the center section where it belongs and eliminates premature rear end failure. The seal housings are o-ring type with spring-loaded seals. The i. d of tube should be measured to ensure a proper fit. It is backed by a 90-day limited factory and sold individually.