Ive been eyeing those inner fenders because they do stick out a bunch. I’ve done a little hammering but it definitely is going to need more. Going to wait on wheels to see how it mocks up before hammering too much as every square inch of leg room is precious in this truck. I did move the axle forward with the SAS but we’ll see if it is still enough.before you get too deep you need to clearance the firewall/inner fender, your 36s will clear but your 40 likely will not. Most people do 1 of 2 things, make room with a BFH or move the axle forward a couple of inches.