If you have the 0 mm offset version, (5" backspacing on a 9" width rim), you will likely need to lose your front mud guards and do the pinch weld mod, (see the link in my sig). I needed to with a 2.5" PRG leveling kit, and 33.98" Nitto Tera Grapplers, in a LT305/70R17. The BFG are just slightly shorter at 33.7" diameter.
That width and backspacing sticks out 1.5" more than stock, where I had 8" rims with 4.5" backspacing, and so they only stuck out 1" more than the SE/LE rims, and 1.4" more than the old Off Road rims. [The more the rim sticks out the more likely it will rub at the pinch weld when turning, (makes a bigger arc)].
If you have the +25mm version, that's 6" backspacing, (really tucked in), so they will only stick out 1/2" more than stock, they'd probably clear. They would clear on the stock rims.