Let It Snow

[cpayne5]

Originally Posted by firstdown

I have been driving around our (new to us) full size Yukon. It has Auto 4x4 which only kicks in when a back tire spins which is nice because I don't have to switch back and forth. If you drive in 4x4 high/low on dry roads it can distroy your transmision.

Not your transmission, but your transfer case, and only if the transfer case is locked. All 4 wheels on a car travel different distances (think turns) and if your xcase is locked, binding will occur because the front wheels travel a different distance than the rear wheels.

In snow, 4hi is more advantageous than 4lo. In snow, momentum is the name of the game, and 4lo will just slow you down. In most vehicles, it is no more aggressive, just provides lower gearing. Most people will never need a reason to use 4lo.