Porsche 2012 911 GT3 CUP Technical Manual page 71

20. Secure the 5th / 6th gear selector fork with the roll-pin
When pressing in the roll-pin always support the selector fork with
special tool 996.450.315.9A
21. Fit the special reverse gear tool 996.450.311.9A
22. Engage reverse gear by rotating the selector barrel. Slide the
selector fork and dog-ring till reverse gear is fully engaged.
There must be play on both sides between the selector fork and
dog-ring
23. Tighten the clamping screw in this position
The reverse gear selector fork clamp screw must only be
tightened when the cut away housing is in position
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