I'm replacing the heater lever assembly and am having a bit of trouble figuring out the removal of the radio. I've loosened the visible bolt at the top rear bracket but the radio seems to be no looser. Does it slide out the front without the removal of the knobs or is it held in by a bracket at the front also?Also what is the silver box on top of the transmission tunnel beneath the dash, it looks a bit radio oriented but am unsure.