Maybe I missed something in the post??? What was the problem?
Tires stopped spinning after burnout but sounded like it was still spinning??? Maybe you accidently shifted it into neutral?
I have a Abruzi racing powerglide in my car and I love it, no problems what so ever, and talk about great customer service they are the best!
If it were me I'd just pull the pan and do a looky loo. You'll see some clutch dust and thrust bearing material but it should be minimal but if its looks like your panning for gold and you hit the jack pot, do some investigative surgery.
Goodluck, Charles