I am curious if anyone knows if there is a maximum speed in which you can drive while in 4WD, before damage occurs. And is there a maximum speed in which you can shift into 4WD. I have shifted many times into 4WD at speeds around 55 mph. I have driven down snowy roads in 4WD at 70mph and I have had no problems. There is a slight whining noise at higher speeds but that is expected with the front transfer case engaged. I haven't seen anywhere in the owners manual topics such as this. It just tells you how to hit the button to engage 4WD. A guy I work with has 96 ford truck and his manual says not to shift into gear at speeds higher then 25mph, but he has a manual shifter on the floor. Does that make a difference, or is it just the FORD thang?