had a new tranny and transfer case installed in April, now having problems with the rpms rising and dropping and engine revving. any ideas as to what could be going on? please help i've had the ecp sensor replaced, solenoid replaced, wires replaced, new center support put in, now having a transmission range sensor put on

 

What does the fluid look like? Does it do it more under load or while cruising?

 

Is it still under warranty? I'd take it back to the shop that installed it.