The sealing rings are synthetic resin with chamfered ends. Check the condition of the sealing rings, and replace them only if they are worn, distorted, or damaged.
For a better fit, squeeze sealing rings together slightly before installing them.

Apply ATF to the new sealing rings, then install them on the secondary shaft.

After installing the sealing rings, verify the following:
The rings are fully seated in the groove.
The rings are not twisted.
The chamfered ends of the rings are properly joined.
Clutch Pedal, Clutch Pedal Position Switch, and Clutch Interlock Switch
Adjustment (M/T)
NOTE:
For a cruise control problem, check the clutch pedal position switch.
For a clutch interlock operation problem, check the clutch interlock
switch.
Remove the driver' ...
Navigation Commands
The system accepts these commands on a
map/guidance screen. ...
Mainshaft Thrust Clearance Adjustment (M/T)
Special Tools Required
Mainshaft Base 07GAJ-PG20130
Collar 07GAJ-PG20120
Mainshaft Holder 07GAJ-PG20110
Remove the 72 mm shim (A) and oil guide plate M from the transmission
housing ...