I hope you didn't pay too much for the box and shipping. I've seen the prices posted for rebuilt boxes which aren't bad if the box wasn't available locally. I paid $75 for the Z box.
One thing that you might want to do is spray some oil on the bolts so they'll come out easier and you might want to check those bolts because they have a tendency of rotting out in the frame.
One thing that you might want to do is spray some oil on the bolts so they'll come out easier and you might want to check those bolts because they have a tendency of rotting out in the frame.