National TH400 Turbo 400 3L80 Rear Extension Seal

Quality rear extension housing seal for the GM TH400 Turbo 400 3L80 heavy-duty automatic transmission. This National rear seal ensures leak-free sealing and proper fluid retention throughout the transmission. Essential for rebuilds, reseals, and routine maintenance of TH400 equipped vehicles from 1964 to 1990.

Direct fitment for all TH400 3L80 applications in Chevrolet Corvette, Camaro SS, Chevelle SS, C10/C20 trucks, GMC trucks, Pontiac GTO, Firebird, Buick, and Oldsmobile vehicles. National quality ensures dimensional accuracy and long-lasting sealing performance under all operating conditions.