I am so glad I bought the extended warranty for my 2014 2500, 2016 noticed a rpm flare 2-300 rpm on 4 to 5 shift. Asked dealer to check it when getting oil change, no codes got the "they all do that" line. 2017 trans failed limped to dealer, valve body bolts came loose , fixed under warranty, 25000 miles. Complained again abbout rpm flare , now its 3 to 4 and 4to 5 shift. Again , tech says its okay, no codes,just converter slip before locking up. As far as I know any rpm flare after shifting is the clutch pack slipping in that planetary gear set. Same thing as with a manual trans when you don't let the pedal out too slow when applying the throttle.
Next was the exhaust brake quit last fall, first time extended warranty used, they even covered extra rental car fee because they could not get an inspecter there right away. Then the ignition switch failed on 2/27/21 with 48000 miles, towed to dealer. Told them to check the trans while it was there. The switch was fixed under warranty, almost 900.00. Tech said there are no trans codes. Had to go take him for a drive to show him! Result, they took it apart, 4th , 5th and over drive are bad. Excessive play on input shaft, recommending replacing torque converter and trans. Hoping extended warranty covers it.
Shifting rpm flare caused by slow torque converter lockup is B.S.!
For me, CNA National Z Series extended warranty is well worth it for me and the Recall Ram!