Quote:
Originally Posted by Tim.LSR
Wow, one would have to be pretty extreme to want to do that operation somewhat permanently. It is not like you can just pop open the hood and switch that back and forth when needed.
According to Tim M., in another post he mentioned that the 4H/4L transfer case and differential is NOT a limited slip, front or rear could get 100% of power (but ESP would kick in first).
The full time 4WD - no 4H/4L switch - system uses a limited slip differential that is very limited - 6% or less.
In other words, you are not missing much without the 4H lock/4L/N switch unless you really, really need those features.
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The transfer case with low range operates in limited slip normally, which is awd. It can be locked in high range, which makes it a plain old 4wd. And it is always locked in low range, like plain old 4wd. When in locked mode, the open differentials means it will tend to spin any wheel with less traction, just like a plain old 4wd.
The GV of course has abs-based traction control, which is used to stop spinning wheels from spinning, and thus transfer traction to wheels having traction.
BUT this is configured to disengage after a few seconds of high throttle, or if the imbalance in traction between the wheels is more than moderate. Sort of like limited slip. But it means you can never send 100% of throttle to one wheel, and it means the GV is still disappointingly vulnerable to losing traction in the common and classic problem of unloading diagonally opposite wheels while climbing.
This prevents overheating the brakes and damage to the lightweight axles etc, but cripples the GV in certain obstacles such as diagonal ditches while going up steep hills.
In my current avatar picture, the GV required three tries to get through what looks like a pretty minor ditch. In fact, it was on an uphill. I was trying to take the ditch at a diagonal angle to reduce the risk of scraping the bottom or back end. I ended up having to take the ditch almost straight across so that the wheels remained planted on the ground. Luckily there was enough clearance.
If this had been on otherwise flat ground, which is the case when traction control systems are tested by automotive journalists, the GV, and suv's with similar systems, would have had no problem at all.