Porsche 2012 911 GT3 CUP Technical Manual page 66

5.10.3. Gearbox assembly
1. Fit the splined 2nd gear and the 3rd and 4th idler gear wheels etc to
the input shaft before pushing the complete shaft through the mounting
plate.
2. Tighten the collared input shaft nut to 220 Nm.
3. Bolt together the split input shaft and fit the sliding sleeve and circlip
4. Fit the selector rod with the 3rd / 4th selector fork and push the cam
follower into selector barrel track.
5. Fit the splined 4th gear wheel to the pinion gear shaft.
The 3rd/4th fixed gear wheel is not symmetrical and must be
mounted with the raised surface facing the mounting plate.
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