Eztrucker78

I have a 95 f-150 with the 5.8 liter and the E4OD trans. I drive it for a hour or so stop the truck shut it off for a hour or two. When I start it up to drive back and maybe drive for 30 min the o/d light flashes and makes the trans shift hard and stay out of lockup. I have replaced the vss sensor on the rear with a ford sensor. The only other thing that I think maybe relates is my voltgauge is charging above Hal then after I stop for a it right at half or less. So if anyone has any ideas please help thank you!!!!