When is does this, does your O/D light blink on/off? What rpm and speed range do the symptoms occur in? Is it at the point where the T/C begins to lock, or before that?
It could really be a variety of things. Hard to tell until more information is given. My gut is telling me low line pressure due to valve body or pump issues.
On edit: Do you have a trans temp guage?
It could really be a variety of things. Hard to tell until more information is given. My gut is telling me low line pressure due to valve body or pump issues.
On edit: Do you have a trans temp guage?