Vehicles can have Part Time 4WD , Full Time 4WD or Permanent Mode . Part Time Mode : Do n't drive for extended periods on dry pavement with 4WD engaged . Full Time 4WD offers both two - wheel drive mode and 4WD . This is extremely critical for locking up on 4WD vehicles .
Vehicles can have Part Time 4WD , Full Time 4WD or Permanent 4WD . Part Time 4WD : Do n't drive for extended time on dry pavement with 4WD engaged . Full Time 4WD offers both two-wheel drive mode and 4WD . Maintenance is extremely critical for locking hubs on 4WD vehicles .