I have a 94F150 that has a vibration when it is in overdrive could anyone tell me what might be the problem.

 

Probably low on tranny fluid.

 

no it is not low all fluids are full the tranny shutters when in overdrive

 

possiably over full??? does it do it when your just in drive? thats got the 5.0 with the E4OD right?

 

no it does it in drive and overdrive and it has a 300 6 with a c6 tranny

 

get going down the road, then slide it into neutral, if you still get the vibration check the U-joints!!

 

already checked the ujoints not them. it only does it when you reach driveing speed and then put a little pull on the tranny ie accelerate slightly. and if you are in overdrive when this occurs you can shut the overdrive off and it quits. question could it possibly be the shift censor?

 

C6 trannys, did/do not have overdrive. You probably have the A4OD trans. Wish I could give you the answer you are after, its probably inside and the overdrive clutch slipping. Worked with a tranny man 20 years ago, he always suggested to put 12oz of laquer thinner into the oil and drive it a week or two, and then do a complete service. He felt the thinner would deglaze the clutches. Just a suggestion.

 

You are right it is an A40D. I think I have it solved. The fluid has broken down in the converter. I was told a complete flush should take care of the problem. This was told to me by a Ford tech that I have not seen for a long time. Thank you so much for your advice. It was appreciated

 

If the tran is sound and the torque converter can be drained, service the tranny and refill with Chrysler ATF+4....it's amazing what that stuff does for Ford transmissions.

I have an AODE (155K miles) and a 4R70W (121K miles) both filled with ATF+4 and the trans work flawlessly.

The 4R70W is in my 97 F150XLT; yesterday it was serviced and refilled with ATF+4 and a significant improvement in performance was immediately noticeable....smooth, firm shifts, no TC clutch shudder. (The 4R70W and AODE are noted for 3-4 synchronous lock of the planetary gear set. That transition is vastly improved in quality with the ATF+4 compared to the standard fluid. )