removing manual transmission's bell housing
 

I have a 2003 CTS 3.2 with a 5 speed Getrag M35 manual transmission. I want to change the clutch, but have run into a problem dropping the transmission. The problem is removing the top bolt that holds the bell housing to the engine block. The rest of the bolts are no problem, just the top one. Does anyone have any idea how to remove it?
I would appreciate any help.