Hard shift from 6 to 5

[Mcmac]

Hello first time diesel truck owner. Ram 2500 new truck, at around 1500 mi it started down shifting hard from 6 to 5. It does it when trans fluid temp at about 160 deg or more. It started doing it after towing for first time. Towed a fifth wheel for 250 mi with exhaust brake on. Per the manual I didn’t tow for the first 500 mi and I kept it under 50 mph. It’s at the dealership sitting for its turn and it sounds like they may do a relearn.

About to hit the road for a couple months and looking for some reassurance. Has this happened to others? How did it turn out??
Thanks!

 

[MtnRider]

Have never heard of that but without actually feeling it myself it's hard to say if it's "normal". ~170 is normal operating temps for the transmission. Exhaust brake on full will also make it feel like it is downshifting hard if you are not used to it? A relearn could fix it or the dealer may also come back and say it's normal?

Let us know how you make out.

.

 

[Brutal_HO]

Tow Haul and Full on EB will make downshifts very aggressive if you lift.

Please describe more about the conditions and terrain, etc. you're experiencing this shift.