My truck does the same thing from time to time. Had it 2 yrs. now. First got it, took to shop that has done a lot of trannys for me over the years. Did the oil change bit and everything tested fine. They told me to drive her till she dropped and thats what I'm doin. been 2 yrs and shes still truckin the loads for me. Never had a truck that could stand this much and i've had a few of em.