For General Motors. 2010 Camaro with Tremec Transmission The J-39441-20 is used with the J-39441 to install several gears and synchro hubs onto the transmissions mainshaft and countershaft as directed by SI. J-39441-20 is also used with J-39441-30, which includes a bolt and thrust bearing to thread into the output shaft, to draw the 5th driven gear into position on the main shaft. Hammering the gear into position will cause component damage.
