CT4152 - Everything needed to completely seal up a leaking extension housing on a TH400 transmission. However, this item includes the HARD TO FIND smaller rear seal and bushing, more commonly found in 1964-1967 Turbo 400's.. Bushing measures approx. 1.80 inches OD and seal measures approx 2.50 inches OD. Includes rear tail housing metal clad seal, bushing, gasket, speedo housing oring outer ring, speedo housing inner seal. 1964-up. New and unused. Usually the number on extension housing that uses this item is 8623214.