Yeah, I thought it had to be something of a larger gear, or tire outta whack, because of the wobbally sound. I was hoping I didn't have to dig too far into the tranny.
After making me upset with it's proformance, I put the ST away for awhile, and just ran my other trucks on the track. I didn't want to deal with a complete tear down.
After taking the gear cover off, it was obvious what the issue was. The pinion gear had come loose just enough to move to one side of the spur gear
.
This is the second set screw to come loose in a week. Not sure what that's about. Probably old age, and afraid to snug down the set screw too much. I'll be adding some thread lock to my set screws again.
Third of the way around the spur gear.