And also think for the 4Runner, it's actually 2 different options, cause one is 4x4, while the other is AWD...for 2016 it's the Trail Edition that's 4x4, Limited is AWD (In Canada anyway).
I'm not 100% familiar with the Pathfinders and their options, but to me, they were all 4x4.
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Well, it may be a quibble but I wouldn't call it "AWD." To me, at least, "AWD" is a system that is usually found in cars where power is transferred directly from the transmission or transaxle of the primary drive wheels (usually the front wheels on modern AWD cars although there are some exceptions to that) and that power is then sent to the secondary drive wheels by means of a clutch or viscous coupling that can vary the amount of power that goes to the normally-non-driving wheels (again, in MOST, but not all applications, this secondary set of drive wheels is the rear.) Such a system does not use a transfer case to split power between the front and rear axles.
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OTOH, the system that the 4runner Limited (and the QX4) has actually does use a traditional engine - transmission - transfer case layout, where the transfer case is used to split power between the front and rear axles. The difference being that it also incorporates a differential in the transfer case (center diff) that allows the vehicle to run in 4wd all the time even on paved roads. Yes, I know it's a quibble, but I don't call that "AWD", I would call that "full time 4wd" because it uses the same layout (engine-transmission-transfer case) as a conventional 4wd vehicle, but adds the center differential to allow for on-pavement use of 4wd.
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The non-limited 4runner uses a very similar arrangement, but without the center differential.
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And to throw even more confusion into the pot, the 4th gen (2003 - 2009) V6 4runner takes the full-time-4wd system I described above and adds a 2wd option as well. So on a 4th gen 4runner, you can run it in 2wd, in 4wd on dry pavement with the center diff unlocked (full time 4wd) or you can lock the center diff and then it becomes a conventional 4wd vehicle. I would describe this as a "multi-mode 4wd system."
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Again, please understand that these are MY terms that I use to describe the various 4wd systems - as the saying goes, your mileage (or your terminology) may vary.