Gen 6 – Trying to understand how (technically) the ‘transfer case’ works on the T-XT.

First off, the rear bias is supposed to be somewhere around 30%, with the maximum rear bias amount obviously 50%. With that little difference, I don’t understand why not just put a freaking Torsen unit and call it a day, since it’d never require service. But since we have a freaking clutch unit, I want to understand how it works. If it was locked/clamped all the time (which should be the case IMO, like a normal LSD, and the additive in the fluid allows rotational differences), bias would be 50/50 all the time. But since it’s about 30, what exactly is happening? Are the clutches constantly slipping a little, or how exactly does that unit work? If the clutches are slipping a little, there’s no freaking way they’d last 100K miles, and even less 200K, right? So are we looking at some kind of maintenance on that darn thing, if we keep these vehicles that long? That’s basically the reason I’m asking how this thing works; to determine how long it’s supposed to last. If the clutches lose clamping power, then it’d basically be a FWD OB… but would the system trigger a CEL if that happens? Or you’d find out the hard way when the rear wheels have no traction when you need it? Just curious about all of that, and what can be expected to be the life of that clutch unit. And what I don’t like is if anything happens to that darn unit, the entire power-train has to be dropped, right? I don’t see space to detach the transmission from the engine, but could be wrong. Hopefully the experts here can provide some answers. Thanks gang.

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