I just didn't see any other way with the room I had. Even with the cover off, it wouldn't work for me, the studs were not coming out. The last bolt would have required a hole in the AC box to slide it out. Perhaps just the heads would fit after the some of studs were in, but it wasn't happening for me. I wonder if there is a difference with a CC and a regular cab for space?You don't have to pull the evap. I took half the cover off and was able to pull the heads and do studs.