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.
Driving with the Paddle Shifters (Sport only)
Using the Paddle Shifters in D position (D-Paddle Shift Mode)
When you are driving in D position, you can shift the transmission up or down
manually with the paddle shifters.
To shift up or down ...
Hands Free Link Control Unit Input Test/Replacement
With navigation
Remove the driver's dashboard undercover.
Disconnect the 32P connector (A) from the HandsFreeLink control unit (B).
Inspect the connector and so ...
A/T Differential Carrier and Final Driven Gear Replacement (A/T)
Remove the final driven gear (A) from the differential carrier (B). The
final driven gear bolts have left-hand threads.
Install the final driven gear on the differential carri ...