how about some more details? like how you’ve been racing a 600 HP car with the stock tranny and rear end for how long now? 5 years? and you expect it to last forever? shit happens, idle and part throttle tuning wont blow a T56.
When i blew my first T56 the first time i noticed was when i was driving normal. I did a soft shift from 2-3 on the highway and then 3rd popped out into nuetral. its what happens when you race. shit breaks.