Posted by dhermesc on September 28, 2010 at 13:15:46 from (24.248.193.103):
In Reply to: Best new snow vehicle posted by sodly on September 28, 2010 at 10:26:42:
Depends.
If you are driving on road the best vehicles you can buy are the AWD crossovers. They actually have power going to all 4 wheels and can be driven at highway speeds while still locked in 4X4. They are built with "flex" in the drivetrain to allow them to do so without damaging the powertrain. ABS braking ensures the tire with the most grip gets the most power directed to it.
Any "traditional" 4x4 like a Ford F150 will have issues with being driven at highway speeds while locked in 4X4. The owners manuals advise you not to do so - even the one for the Ford Raptor. The mechanical drive while good for off roading to get through pastures and fields will cause significant wear to the powertrain and tires if driven much at road speed.
As you noted few pickups have locking differentuals front and rear. But even the most base 4WD pickup models in Ford, Dodge and Chevy are offered with limited slip front and rear axles but but I don't think any are offered with true "locking" axles. Limited slip in most new trucks means that while spinning one tire will spin 2 revolutions for every 1 revolution of the tire on the opposite end of the axle. Some go as far as 3:1 slip, mainly to make the truck more "streetable". A 1:1 can be made from over the counter parts, but will be very hard on the drivetrain.
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