My first 2018 Raptor was reclaimed by Ford under California's Lemon Law after they could not fix the same wide open throttle, 2WD, 5200-5500 rpm, NOISE/RATTLE that happens while shifting from 3rd to 4th and 4th to 5th in the 50-75 mph range. Floor the truck allowing the transmission to shift when it wants to in 2WD only, and it makes the noise every time in the 50-75 mph range. Truck does not make the noise in 4WD. It took a year for Ford to build me a 2019 and deliver it. New Truck did not make the noise till 1500 miles. Now my 2019 makes the same exact noise and the local dealership had the truck for 2 weeks with absolutely no luck fixing it. The Area Field Technician has been involved the whole time. I am running 91 Octane Chevron gas and they do not feel that it is an engine detonation. Because the noise only happens in 2WD, The dealership thinks the problem is in the transfer case. The Dealership replaced every single part in the vacuum system that locks up the front wheels in 4WD TWICE in my 2018 and it did not fix it (yes the hubs to). They disconnected the vacuum lines to the hubs on my 2019 and it still makes the noise. 2019 Truck in going to a new dealership today for a fresh set of eyes to look at. They replaced the cheap vacuum lines and check valve twice on my 2018. They checked the wastegate in my 2019 for the rattle, and say it is tight. Any Ideas??? Would somebody please go run their GEN 2 raptor from a stand still to 75 mph in 2WD and reply if it makes the same noise (kinda sounds like engine detonation/ping). Any help would be greatly appreciated before I have to have a SECOND GEN 2 reclaimed under the Lemon Law. A California Raptor with 91 Octane would help when trying to compare apples to apples just in case it is detonation.