I'll keep this short.

2023 F350 Supercab Longbed SRW
71k miles
Michelin AT tires with 20k miles form DTC

Several weeks ago I noticed a vibration at about 30 mph. It would subside at around 40mph then rumble around 60 mph.

DTC took the tires off to check the balance and tires were good.

I then took the truck to the Ford dealership and they said the driveshaft was "Bent " but showed no evidence of an impact. The video they took confirmed it was bent. Fortunately I have an extended warranty and it will cover the cost to repair.

My question is what would cause the driveshaft to get "bent" after 71k miles? Why would I only feel the vibration now? My days of mudding are long gone.

TIA

Edit- I pull a 34' RV that might weight 13k lbs including 2 batteries and all the usual stuff. Thats well below Fords weight range.

Following. I have the same truck with only 62k miles. Good luck!!

Maybe road debris?

Is it possible it was over-torqued and they're just calling it bent?

most likely is that it threw off one or more of the balancing weights. stealership probably doesn't even have a driveshaft balancer, so its just easier for them to install a replacement.

My '17 came that way as well and didn't realize what it was until warranty was out, had a 5" made for it and it's fine now. I have a video of the old one on the lathe and it was out pretty bad