engaged 4 wheel drive at 70 mph
i have a 2001 f150 with 4 wheel drive. the **** to engage the 4 wheel drive is just to the left of my fan control for the heat and a/c. twice now i have accidentally engaged the 4 wheel drive while going down the road at about 70 mph while meaning to adjust the fan control for the a/c. i disengaged the 4wd as soon as i realized my mistake. what kind of damage could have been done? how can i tell if i did do any damage? i don't offroad, i just wanted to 4wd for trips to colorado so i don't actually use the 4wd very often, so if the differential is damaged now, i can't tell it. would appreciate any input or suggestions. chuck caton, wichita falls tx.