What is TCC Slip RPM?

I'm not understanding what TCC slip is and how to set it or if I should touch it at all.

I was looking through the file for our A40 TCM Allison 1000 and one of the parameters (I believe, I may have the wrong name) was TCC Ramp settings, which if I understand correctly is how quickly the TCC applies.

Withing those settings, one of the sides of the table was TCC Slip (RPM). I've tried finding videos and reading about it, but I'm still not understanding.

What exactly is TCC slip? What should it be and how do you properly adjust it when tuning a transmission?

I'm NOT any sort of auto' chap, but I suspect it's related to the difference between the engine rpm and the input rpm of the transmission, and the change as rpm increases.

For example, you may have a, nominal, 1800rpm stall torque converter. In theary this means if you apply full throttle the engine will hit 1800rpm initially, and as the vehicle starts to move off, and the vehicle increases speed, the input rpm will increase to get close to the engine rpm at peak rpm - IIRC around a 5% slip is common for a non-locking torque converter.

This means, if I'm looking at it correctly, initially there will be a 1800rpm/100% slip that changes to, say, 200rpm/5% slip at 4k engine rpm. Some may think of this as a "ramp" as it changes through the engine rpm range.

Oh, the engine torque will also affect the slippage, just to complicate things.

Don't know if that helps, but might suggest a path to investigate.

Hopefully, some of the auto' experts can come in and correct/expand on that.