[vulcan300]

Hey there, I had a lot of fun last night doing the same thing you're doing. I higher torque impact gun is a must for this kind of thing, although it should move if you use a straight bar with a 4 or 5 foot pipe extension. To make things far easier, and to minimize damage to the thread of the bolt and the trailing arm, and reduce the amount of force you need to use to remove the bolt, use a jack under the brake disk to compress the shock and remove pressure on the bottom bolt (this assumes you haven't already removed the top bolt). Good luck.

J