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If you get under the car, you will see a braided line going into the transmission. Reach up about 6" and you will feel the screw (you can't see it). It is 11/16" and you'll need a thin-walled socket.
2010 Camaro RS/SS (rotofab, headers & catback)
2007 TBSS (TVS 2300)
2006 Silverado CCSB (TVS 1900)