Torqueflight vs. Autocross

I've been spending every free minute of my life in the garage lately and I'm hoping to be ready for some autocross before the end of the season. Someday I will have the resources to swap in a proper manual box but that Silversport T56 swap that I'm drooling over is years away...so for now, it has to be run as-is.

I still have some unanswered questions about running this car, not the least of which is what's going to happen to the transmission under typical autocross flogging. I am running an A904 with some upgraded internals and a deep pan but no manual-shift valve body and IIRC, a stock sprag assembly. Probably also worth noting is that the transmission is spinning a 4.10 axle.

Often in autocross, the transmission (auto or manual) would be left in second gear which means that you alternate between heavy throttle and closed throttle. This can be a means to get the car to rotate through some engine braking forces on the rear wheels but it's also just the nature of hustling any car through a tight course. Also with any V8/RWD car, there's a very good chance for lots of tire spinning at various points on a given autocross course.

Will these conditions spell certain doom for a Torqueflight? Is this asking for sprag-destruction?

Currently, I'm sliding around on no-season BFG T/As but at some point I will have the cash for some modern/sticky rubber. Safe to say that the risk of damage will only go up?

Thanks for any insight/experience!