truck had been driving fine. Then stopped and parked for 2 hours. When tried to leave, shifted to R no go. Truck acted like the the emergency brake was on but was not. Shifted to N, truck went forward like in D. Still truck acted like in low. Shifted thru all 4WD switches and can hear shifting . But same outcome. Truck will only go about 5 MPH in any gear except R. In R truck will not move. Trans. not making any noise. Fluid level correct, possibly even high.?? Thanks