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.
Gauge Control Module Replacement
NOTE: Before replacing the gauge control module,
retrieve the ODO value and the maintenance minder information from
the gauge control module with the HDS.
Remove the instrument panel.
...
Edit Waypoint Search Area
INFO button
► Setup ►Other
►Routing & Guidance►Edit Waypoint
Search Area “Edit”
Select the distance from your highlighted route line (on either side of your
rout ...
Transmission End Cover Removal (A/T)
Special Tools Required
Mainshaft Holder 07GAB-PF50101
Remove the bolts securing the ATF inlet line (D) and ATF filter holder
(E), the line bolt and sealing washers, and remove the ATF in ...