What gear for burnout with 727

2nd is good.
But it won't hurt anything to shift it from 2nd to 3rd in the burn out.
The problem is 1st gear only & chirping the tires on the way out.
They say its ok to start in 1st & go to 2nd quickly. But I'm not going to do it.

Also, if you ever have a driveline failure in first, pull the trans to have it looked at.
Do not run it until you do that.