transmission is auto-with overdrive on 1995 Ford F-350

over-drive off light blinks off and on, also it began shifting real hard fluid level ok, it has powerstroke engine,

Asked by for the 1995 Ford F-350
Chek your fuse that is 15 amp chang it to a 20amp and it will stop doing that am a tech on fords that's all I have at my house and I have a truck that did the same thing
best explanation i have heard
2 more answers , 1 more comment
The light is indicating that the transmission controller has detected a malfunction, the hard shifting is probably bacause the controller is running the trans in fail-safe mode to avoid damage to the unit. When the light's on, there are data and trouble codes stored in the controller which can be accessed by a technician with a scanner. Find a transmission shop or a Ford specialist.
Here's a directory link for you:
thanks for your replyes
What fuse?