I got a 97 k1500 with a 4x4 on the floor, I used the 4x4 to go up a icy hill then shifted back into 2wd going about 15mpg. I drove 10 miles no problem then i passed a car and i heard a loud pop at about 65 and then I punched it and got up to 65 again after I got on a new road to see if I could...