Here the problem I been having it shift hard when going into 3 rd gear and 4 th gear , another thing I notice is when it go into 3 rd gear the rmp drop to 1100 then in 5 sec it go back to 2000 rmp then it will shift into 4th gear really firm . Sometime it will shift smooth though all the gear . Any Suggest what may be causing the problem?

2005 Dodge Durango 3.7 with 119,015 miles

 

Check the fluid and see if any trouble codes are showing.
FF

 

no code fluid is good