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Using two 13mm wrenches, loosen the shift stop lock nut and adjust the shifter so that you have one full business-card width between the end of the stop and the shifter handle AFTER you've put the transmission into Second gear. It's important to take your time and feel out the engagement point. You may also choose to do this with the transmission in the car, as it may be easier to feel with the engine running. Now simply reverse the disassembly process and put your GTO back together. There aren't any special reassembly procedures other than lining up the input shaft into the clutch. The rest is quite simple. Be sure to torque the bellhousing-to-engine bolts to 37 ft-lb and the transmission-to-bellhousing bolts to 25 ft-lb. You will obviously need to bleed the clutch, which is accomplished by pushing it to the floor and having someone open and close the bleeder until all air is exhausted from the clutch hydraulic system (or you can reference "Driveline Brutification" in the November '05 issue of HPP to learn how to powerbleed the clutch). Be careful to keep a close eye on the clutch fluid level, as during bleeding you can run the reservoir dry in about two full pumps.