Posted by TimV on December 06, 2015 at 16:29:38 from (74.78.234.72):
In Reply to: AWD versus 4WD posted by Dan in North Houston on December 06, 2015 at 15:41:36:
GM had troubles with some of those of roughly that era when people used them to plow snow--the nature of snow plowing is that you ARE going to slip and spin, and the programming didn't allow it, rendering them pretty much useless as plow trucks. The folks have a 2005 3/4-ton and that's fine as a plow rig, but it also has 2H/4H/4L selection. Believe later models either added an override, a different mode, or some other fix--not sure exactly what. Worst one I ever saw was a friend who bought a brand-new Kia minivan of about that vintage. What an unutterable pile of manure THAT thing was--among many other issues, the AWD "logic" simply applied the brake to whatever wheel was slipping, as soon as it slipped. If all 4 wheels slipped, there you sat. His driveway is on a tiny, almost unnoticeable downgrade from the road (I'm talking a couple inches in 40 feet) but it was enough that if there was the slightest bit of snow, ice, or even wet grass and the wheels slipped WHATSOEVER, you went nowhere--the van simply sat there. On several occasions, we had to manually push it into the road (again, with NO help from the van--it would NOT spin a tire, and there was NO over-ride of any sort) in neutral before it would get enough traction on all 4 wheels at once to go. Even sand under the wheels wasn't enough--the tiniest slip and the wheel got braked, and as soon as all 4 slipped, it was time to start pushing. It was quite a relief when someone kindly totaled it for them, luckily without major injuries to anything but the van.
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