Best case, you have a bad input or output speed sensor. Otherwise, find a transmission shop.

The input and output RPM of the transmission is monitored. That's where the speed sensors come into play. If they are working correctly then it could be a problem with a slipping OD clutch. It can also be leaky seals internally.

Needs more diagnosis.

 

Awesome, thanks for the reply. I ordered new input and output both because from what I've read its better to replace both since if one goes then the other is prone to do so as well. Cheap oem price. I will replace them when they get here sometime this week and update. Thanks again.