I have a question for all the transbrake guys with th400.

How hot does your trans fluid temps get while on the brake and how long are you on the brake?

I noticed an issue on my second outting at the track. I have what i think is an abnormal rate of temperature rise while on the brake which ultimately led to burnt fluid and now loss of first and second gears. I am only on the brake for 2 seconds it seems and my temps rise from like 110-120 at start to 260 at end of 1/8 mile pass! Its unreal. I didnt notice this last time out but i made 3 passes this second time out and just happened to see how hot it got!

Everything seemed fine til i let car cool down completely and went to go home. Put it in first and car wouldnt move.. Gave more and more gas and finally started moving. I thought i left ebrake on! Driving around it felt fine at speed in 3rd but at stops, i really noticed i had no 1-2 shift which is heavy on part throttles. That was no longer happening. Rpms never changed while moving 1-2-3 3-2-1 at speed.

Took pan off drained fluid. Fluid was way dark and burnt. But no heavy particles in pan. Just looked of burnt sludge.
Replaced fluid and still no gears.

Now i have a good reverse gear and tbrake still functions. It holds as rpms go up but when released it feels like its straight to third.
So what you think is wrong? Could it be a sludged up shift valve or something within the trans or valvebody? Or something break?