My car felt weird in the main on Sunday, the rear pinion screw came loose. I lock tighted them while building it. Took awhile to clean the grease out of the threads on the center shaft yesterday. Hopefully I got enough grease off the threads so the locktight can do it's job. I'll be checking these pinion screws threw out the race day for a few weeks. The good thing is the pinion/shaft/ring gear look fine but the true test will be when I run it later this week. To be safe I ordered some parts yesterday.