Sorry for the late reply guys. My transmission is toast I think. Don't know if a rebuild Will fix it. It sounds like a telephone is ringing when I shift to fourth and fifth. Very annoying. I also don't know if the engine is weak or if it's all the transmissions fault. When I go up hills, the truck can barely go up them at all. The speedometer maxes out to 55mph. Only when going down hill does the truck go past 55mph. It sucks going on the highway and seeing everyone pass you and go out of view and I'm still struggling to get up the hill. Surely our trucks can handle these hills, right?