like General Motors’s AutoTrac, automatically engage 4WD when necessary, similar to an AWD system. But most 4WD systems feature part-time operation. Unless the driver actively selects 4-Hi or 4-Lo when road conditions or driving circumstances call for it, the vehicle is only using two of ...
The Chevrolet Silverado 1500 features an Autotrac 2-speed transfer case with 2-Hi, 4-Hi, 4-Lo, and Auto, that last setting a fully automatic mode that activates 4WD without driver action. What Do 4-Hi and 4-Lo Mean? Adding a bit more confusion to the mix is a 4WD truck’s high (...