I need to do this bit I don't want to have to take my winch off because I can't get to the front bolts very well.
I had the same problem when I needed to install my oil cooler. I ended up loosening the bumper bolts, then was able to get grille out with just a little room between it and the Warn powerplant. Worked great.
2014 JKU Rubicon, Copperhead Pearl, 3" TerraFlex lift, Toyo MT 35x12.5x18 tires, Warn Powerplant,
2010 JK Rubicon, 2 dr., 3" Terraflex lift and adjustable rear track bar, Toyo 35x12.5 tires, custom bumpers, Warn Powerplant, KC lights, B&M trans cooler, etc.