I have a pair of the CCII PRR Sharks. The second A unit would lurch around a lot at a pretty even interval. Upon spinning the flywheel of the rear truck I felt some binding. With the motor removed from the truck, all is well. No binding from either part. When put together, well blah.
These were supposedly never run.
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Yep it is
Probably cracked on installation. Looks like bronze from here.
Plastic gears will shrink and crack over time, unless aged before cutting.
@rplst8, you can see that you are not alone in this be looking over here, but it seems there is a solution in Lionel part 610-8274-080
:
https://ogrforum.com/...haft-for-tmcc-sharks
I do wonder if @gunrunnerjohn can chime in and state his success.
My Sharks are back on the rails, I decided to do both, got the gear and a new truck. I put the new truck on and rebuilt the old one with the gear as a spare. Next split gear I'm covered. 
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