Hello! I have recently inherited my late uncle's Challenger and am pretty new to the world of Challengers, and cars in general. On the highway my 09 RT won't automatically upshift to fifth at any point. If I use autostick to bump it to fifth, then switch back to automatic it will eventually go to fourth if I give it some gas, but won't go back up. I had to replace the shift sensor due to some limp mode issues, but this still wasn't resolved. I'm wondering if it's that, or a solenoid issue perhaps. Does anyone have any suggestions or advice? Thanks!