, be respectful in my thread. If you want to make your own 4L60E thread, you are totally welcome to.
Let’s start by defining “overheating” because it’s been distorted by those trying to make a buck. There’s general transmission temperature, and then there’s instantaneous clutch pack temperature during shifts. It’s the latter one that kills clutch packs, and the former one that accelerates oxidation of fluid (although now it’s a non-issue with Dexron VI).
I’m speaking theoretically here, but the counterpoint to your thin steels argument is that the only way to increase total torque capacity in 4L60E 3-4 clutch pack is to add pressure or add clutch surface. So you do everything to max the line pressure and the feedhole size during the shift.
With that much clamping, now you’re dealing with clutch distortion due to insufficient support. That can be fixed with either an aftermarket input housing (Sonnax SmartTech or 4L79) or the Sonnax 74140 backing plates. Otherwise, simply raising pressure becomes self-defeating.
Once that’s been optimized, the next step is to decrease clutch and/or steel size to get more surface area. Peformabilt uses an 8-clutch setup in their high-end units. Their website does not list which steels they use; I’m sure we could figure it out with math.
After all that, If you have sufficient line pressure and sufficient clutch area, the shift will be quick enough not to cause instantaneous overheating of the clutch pack. And that’s independent of the steel thickness.
OK I’ve run out of words. Hopefully this makes sense.