1998 Ford Mustang Q&A

1998 Ford Mustang Question: over drive light blinking

I drive the car once it goes through one shift sequence the over drive light starts blinking and does not stop until i turn off the car when it is shifting (automatic) it shifts very hard I have checked the transmission fluid level and it seems perfect. -
Answer 1
it sounds like something has gone wrong and your transmission has gone into default mode is it shifting hard? and at a slightly higher rpm? -