Good job on the bracket mod. Its not a mudflap bracket like some people say. Pretty sure the parts list calls it a frame extension. Not sure why it's there, but I surmise it helps with the small Overlap Front crash test and minimizes jamming the wheel into the cab.Finished my 2024 Yukon XL AT4 build today!
Got the 3" ReadyLift, Fuel Covert 18x9 +1 offset, and 295/70r18 Mickey Thompson Baja Boss ATs (34.6"x11.7").
Note if you just do the ReadyLift and try to put back on the OEM wheels/tires, you need a 1/4 spacer in the front to clear the upper control arms. The tire was sitting on the ball joint prior to the spacers.
To get the new wheels and tires on, I had to trim back the plastic bumper on the front side of the front wheels and zip tie back the liner, as well as cut back the lower lip of the liner slightly. In the rear of the front wheel wells, I removed the "mudflap" bracket, and had a local metal fabrication shop bend the outer edge back toward the frame, then reinstalled and zip tied the liner back. I didn't want to remove the bracket completely in case it's there for some sort of collision safety. No rubbing anywhere at full lock and maybe a 1/4" of extra room to spare. Happy with how it turned out, rides great. Hope this helps someone in the future.
Modified bracket:
I used shims to angle the bracket, but did have plans to get them modified like you did.