It's entirely possible that this could be a trans overtemp problem. An overtemp condition will take the trans out of OD until it cools down. I'd suggest making sure that all radiators and coolers are free and clear... find out what could be causing your trans to run so hot.
While I don't think the trans overtemp circuit is tied into the engine temp, a higher running engine temp would contribute to higher trans temps. Consider adding an aux trans cooler?
Proud V8 ZJ/WJ owner of
1993-1998-1999-2002 model years.
[b]Have you hugged your Jeep today?[/b]