Porsche 911 GT3 Cup 2018 Techical Manual page 135

Check the gearshift clearance
Powertrain
Put the transmission in the installation position
The selector sleeves must be centered and move freely
Check the shifting of all gears while rotating drive shaft/pinion shaft
Check the clearance of the reverse gear shift fork
Check the backlash of the gearwheel pairings
Check the position of the gearwheel pairings
Check the free movement of the shift fork
The necessary consistent axial clearance of the shift forks in all gears can be achieved
only with correct adjustment of the shift drum:
3
Engage any gear and pull the idler gear to the guide sleeve (1)
Press the sliding sleeve on the engaged gearwheel (2) and check the clearance (3) of
the shift fork in the groove of the sliding sleeve
1
Carry out this check for all shift forks in all gears
2
2.9.15.3
911 GT3 Cup (991 II)
Version: 4/20/2018
134
MY 2018