Hi guys! Good news. Truck is fixed! Yeah, Liberty, thats what we thought too..LOL. We changed the one in the rear end and it didnt fix it, so we took it to a different dealer, didnt charge us to diagnose it, and they said it was the speed sensor in the transmission. Charged us $145 to pull the pan and change the sensor. We could live with that! Anyway, been running fine ever since. Thanks so much for all your replies. Really appreciate the help! Yall take care and keep on truckin!!