Big Blue: 2005 GMC Yukon Denali

[Senor_Taylor]

How fast can you typically leave a 4WD truck in 4 High?

If you're on pavement? Zero. Since there is a transfer case, not a center differential, you'll bind up your drivetrain when you try to turn. If you're on pavement, there is a chance one of the tires won't be able to slip enough and you'll break something. Some people say it's okay to drive slowly (like 15 mph), but I personally wouldn't risk exploding a differential or a CV axle. 4WD is for offroad use only... unless you don't care about your shit. I know people who drive in 4WD as soon as there is a dusting of snow and they're one quick maneuver left or right on some ground with too much traction away from an accident.