I am having an issue I am hoping to get some help with.

The patient is a 2008 Suburban, 6.0L L76, with a 4L70E. The trans is built, and has a 10" triple disc TCC in it.

I tried putting min/max TCC PWM at 90/100, and the lockup was so firm, i ended up in the back seat. Well, not really, but almost.

So I put it back to stock. I don't have a log to share, but the behavior is this. I am going about 40 mph, and I ease into the throttle. I see TCC PWM go to 0 and then start to build up as it applies. It gets to about 25%, and the TCC begins to lock, TCC Slip drops. But, as TCC Slip drops, TCC PWM begins to drop, say to about 22%. As this occurs, TCC slip begins to increase, and it starts over. If the conditions are right, I can get it to do this continually until my speed either gets above about 45 or 50 MPH, or I get off the throttle.

It makes me believe that there is a table that dictates TCC PWM, as a function of TPS or VSS or TCC Slip. This would solve a lot of problems for me and many other posters I see in the searches I've made.

This is a guess, but I'd put a small amount of money on it.