Ive got a 97 f-250 heavy duty with 155,000 miles on it. Just got it and been working on it so only have had it on the road a couple times. I noticed it has no overdrive light when i push the button on the end of the lever it does nothing, I have not tried hitting hit while driving to see if i feel a difference. The one time I have taken it down the road it kinda seemed like it shifted a little hard and maybe slipped a little not really sure I am not familar with these trucks at all. It almost seemed like it slipped a little as it took off and then when it was at about 40mph it just took off and was fine. Does anyone have any idea whats up with my tranny/OD light ??