Just an aside, but as an engineer I’d be concerned that every time you overheat that rear clutch pack severely enough to go into FWD only mode, that you are taking some severe lifetime out of it. My experience with clutches (and clutch packs in differentials) is that overheating them causes severely accelerated wear. Like, if you keep doing this over and over I’d bet that sooner rather than later the clutch pack will not be able to transfer torque properly to the rear wheels as needed.
PS I also have a ZL1 1LE with the Elsd rear diff (it’s incredible how that thing puts the power down!!!). It is equipped with its own separate pump and radiator and cooling system from the factory. (I’m sure that that clutch pack generates lots of heat during hard track use!!). Even though it doesn’t overheat, it is recommended to change the fluid every other track weekend if you are using it hard. I’d say that if you are tracking your GRC hard, and ESPECIALLY if you are getting clutch pack overheat warnings, I’d suggest changing that fluid often; maybe every track weekend even. Hopefully Toyota will cover full warranty expense on replacing burned out clutch packs on tracked cars (if/when they fail). Running this component super hot over and over is probably no bueno.
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