This weekend had good weekend of racing - kinda. Went to 5k weekend at PGH - new track management and wow what a better program being run there. Made it to the semis Friday to loose. Saturday got to 1/4s and broke a TD shaft rocker. New GM there at track brought me new ones to help out next day and got me back in action. Car was dead on all weekend. Always a big thanks to Ripper here over the years helping me get the right equipment on car. Unfortunately in round 3 I broke something in the rear of the car. Got bad vibration and jacking up car it you can turn the rear wheels about 1/4 turn and then it get super tight and then it will release to be free again - then repeat. Normally the rear tires are pretty free and easy to rotate.

Got car home and was hoping it was ujoint. Pulled driveshaft and still does it. wheels move back and forth a smidge - when it gets tight so dont think its the brakes. And I never get that lucky. My guess is I broke pinion teeth maybe?

Tear into it tonight after work and see. Any guesses

Broken tooth

I broke a pinion tooth 2 weeks ago. Locked up real tight and the rear u-joint was the next weak point. Needed to remove the spool to get the car to roll into the trailer.

1/4 turn on the wheels makes sense that it would be the pinion. Ring gear issue would repeat after a full turn, most likely.

Pinion related.
9310 Pro gears will lay teeth over a bit before they break off.