Did my burn out, staged , on the trans brake,matted the peddle. 3rd yellow lights let go of the button and BANG.Engine hit the rev limiter and she rolled about 10'. Shut down immediately thinking transmission and loosing fluid on the track. Starter guy was on his way as I climbed out of my belts. Looked under the car expecting to see a mess of wet parts, hanging drive shaft or something. All clear. Fired up. engine sounds fine. No Drive or Rev. Got towed back to my pit by a buddy. Thinking sprag broke, new trans time. Started the car put her in 1, looked under and the shaft is spinning. So now im thinking I broke the pinion or possibly the spool. Unlikely it snapped both axles. She has a Ford 9" with a ladder bar set up.