Porsche 911 GT3 R 2012 Technical Manual page 62

5.8.3. Changing gear ratios
 Lock the gearbox
 Open closure plate on gear ratio housing
 Remove circlip from the M32 x 1.25 nut
Remove anti-rotational safety

 Loosen M32 x 1.25 nut
Completely remove gear ratio housing

 Extract shift rod
 Remove shift forks
Remove circlip from input shaft

 Remove M 32x1.25 nut from pinion shaft
 Remove gear ratios, bushes, needle-roller
bearings, hubs, dog-rings and spacer
bushes.
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