e40d..overdrive button flashing!
 

i got a 97 powerstroke and my overdrive button will switch on every once in a while and blink..and when it is blinking my truck will shift so hard it feels like im getting rear ended..then it will go off and come back on sometimes the same day or a couple days later..i went to one tranny shop and they said its detecting slippage and putting more pressure in the lines..idk though any suggesttions or people who are familar with this problem??

It is setting a code and putting it in failure management mode. It is most likely the middle of the end for your tranny.

yup she is history. Make sure you are around someone who can tow you. Timeline is less then a week.:td:

mine did it last week, lost overdrive saturday, she currently is at the tranny shop

yeehaw,let me no the outcome.

gettin a full rebuild, everything cept the casing will be new lol, he said i only needed a new lock-up but with 300k+ on it should just do everything

Mine did the same about 4 months ago, and the same story it was toast in a week and a full rebuild

i have a 1995 powerstroke and my tranny just started actin up it keeps kicking out of over drive. all other gears shift fine just od i have to keep going faster for it to stay in od

well mine won't kick into overdrive til 43 mph

Flashing OD light can also be a rear speed sensor, but with the shifting you are talking about it sounds like a tranny issue.

Try cleaning the connections on the rear speed sensor, its on top of the rear axle.