Join Date: May 1999
Location: SE Florida, USA
I predict that your problem is a cracked torque converter clutch apply piston. That allows pressure that should be holding the clutch to leak past the clutch. This allows the clutch to slip. Once the slip exceeds 50 RPM for a certain amount of time (I've forgotten the time) it sets a slip code, flashes the OD light, and sets the transmission pressure high to try and protect the slipping clutch.
When you disconnect the batteries the code is cleared and the trans shifts normal. Once it recognizes the slip it sets the pressure high and the shifts bang.
The solution is a new torque converter. While the trans is out adding a rebuild is not that much more money.
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Automatic Transmission Engineer 1988-2007
“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson