They've been talked about on here quite a few times, but what you need to find yourself is a 3/4 drive Swench Wrench. What a Swench is is a hand operated impact that's designed similar to a ratchet. They make them in sizes from 1/2 up to 1 1/2 and the 3/4 will give you something like 750 ft lbs of torque both tightening and loosening. They used to be made by Curtis Wright but were bought out by Power Hawk Tech. Usually they can be found on Ebay or some of the government auction sites.