You’re not alone OP. I have a similar issue. 2023 with 32k miles. Has done it since day 1 and I have had the OEM 35 wheels/tires, 37PP wheels/tires and now a set of Methods with said 37” tires. There was one other thread that popped up awhile ago and he was also having the issue. I have been to two separate dealers and brought it up 3x. First time I was told they cant drive the car over 65mph and they wrote it off, didn't even document it. Second dealer told me they could feel it but didn't have another Raptor to compare it with. That same dealer another time told me they could note the vibrations/grinding and suspected it was the tires or the RPG collar. I told them i had put 3 sets of wheels and two sets of tires on the truck and that the RPG collar had only been on 5,000 miles at that point. I just went to Americas Tire to have the road force balance done, tires inspected and another alignment. $200 bucks later they say everything is fine, like I suspected. Unfortunately, I need the truck daily and dont have a viable option to leave the truck for who knows how long with the dealer. If I could I would leave it and tell them I will pick it up when its fixed. The vibration is so bad it puts my foot to sleep and at times the truck honestly feels unsafe above 65mph. Its isolated to the pedal/floorboard nothing in the steering wheel. I have a history with off road race vehicles and it really feels like the rear end or front differential is going to grenade. Or perhaps the driveline is out of balance/bent. But its been 32k miles and hasnt yet so Im a bit dumbfounded, was hoping it was going to just blow before the 36k warranty was up. Let me know if you find any solutions. I’ll probably try and push the issue again in the next month or so.
