LS Swap Torque Stall Converter Hub Adapter Transmission Crank LS1 / LT1 TH400 TH350 Flywheel 551165 GM LS / LT Swap (Gen III, IV, V) Adapts TH350, TH400, 700R4 Fits Gen III/IV LS and Gen V LT series engines Not required on 1999-2000 6.0L stock flexplate (longer crank with flat flexplate) Inserts into rear of crankshaft