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.
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Block and Piston Inspection
Remove the crankshaft and the pistons.
Check the piston for distortion or cracks.
Measure the piston skirt diameter (A) at a point 16 mm (0.63 in)
from ...
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 ...