From the 2020 Explorer Service Manual:
Transfer case
The Transfer Case is a gearbox that attaches to the output shaft of the transmission through a splined input at the transfer case. Torque from the transmission is transferred to the rear driveshaft through the transfer case mainshaft. When torque to the front driveshaft is required it is transferred through a multi plate wet clutch and chain drive arrangement to the front output shaft of the transfer case.
Read that statement, he is talking about transversely mounted platforms like the 2019 explorer, that have a PTU (power take off unit) and a RDU rear drive unit. The rdu has a viscous coupler in those. With the exception of the focus rs and mkz with drivers package those have a clutch type rdu. The ptu never has clutches in it.
I'm drawing a clear line between that and what the explorer st is.
The 2020 explorer has a longitudinal driveline with a transfer case. Yes it has a wet clutch, but the wet clutch is what transfers power to the front not the back like the above. This rwd orientated awd not fwd like before. So the clutch is much less important in transfer case. The power going to rear wheels is direct and doesn't go through clutches or viscous coupling. With the amount of weight transfer on these very very little power is actually getting put down by the front wheels on a launch, and after you get rolling ford backs off the clutches and how much power it's trying to send up front.
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