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The J-39441-30 is used with the J-39441-10 to Install the Fifth Gear onto the Transmission Main Shaft, and with J-39441-20 to Install the 5th/6th synchro hub. J-39441-30 includes a Bolt and thrust Bearing to thread into the Output Shaft and draw the Gear into position, and uses existing hardware from J-39441 to draw the synchro hub down. HammeRing the Gear into position will cause component damage. J-39441-30 is also used by itself to Install the Rear Output flange.