My friend Jimmy Smith had exactly the same problem a couple weeks ago, when running the 7.0 class, it scared him so bad he put it back in the trailer and didn't run. Ladder bar Camero coil over. He checked everything when he got home, ring and pinion, drive shaft, wheels etc. found nothing wrong. It turns out he was rolling to far out of the water box before starting his burnout and the tires were alternately trying to hook and unhook/aka/not enough water for the small motor (355 flattops), i agree you need more wheel speed in the burnout.
JMO
Zip.