Originally Posted by Eugene The Jeep
Not sure. But apparently disconnecting the battery yields the same results as one of these software flashes, so I question the effectiveness of the update. All it does it clear the shifting data that's been stored in the car's computer
That's not necessarily true. The battery disconnect solves some problems but generally not the harsh transmission up and downshifts. You may feel an initial improvement but the harsh shifting always returns.
Early on with the 14's there were some software updates but the only one today that seems to have the highest rate of success is the adaptive relearn procedure. If that doesn't solve the problem then the next order of attempting a fix is to replace the valve body, followed by replacing the transmission. There are countless threads and thousands of posts here on this subject. Everyone who's dealt with a transmission problem has reported varying amounts of success with each of these procedures... with some having no success at all and ending up getting a buyback from FCA.
I had an issue early on with my 14 where I'd be cruising in 8th gear and having it downshift to 7th when climbing up a hill or slight grade... exactly what it's supposed to do. But when I leveled off, the transmission wouldn't return to 8th gear, it would stay in 7th for several miles before upshifting back into 8th. A software update fixed that problem.
Later on it developed the harsh 3-4 upshift and 2-1 downshift issue. I had the adaptive relearn procedure applied. It immediately solved the harsh upshifting but did nothing for the harsh downshifting. After I put 300-350 miles on it the harsh downshifting simply disappeared one day and I haven't had a shifting problem since in the last 9000+ miles of driving.
Since this is a relearn procedure, don't expect an immediate fix to shifting issues. You need to give it a chance to relearn and that may take a few hundred miles, as it did in my case. If you still have the problem after that then the next thing your dealer will do is replace the transmission valve body. You don't get to jump right to a complete transmission replacement until the valve body replacement is proven not to solve the problem.