First off, I did do a search, but did not find exactly the information I was looking for.
My 51 has an 8 lug rear axle that was mounted under the springs. I am replacing that rear with a standard 10 bolt passenger car rear to gain better gearing and 5 lug pattern. While I'm at it, I want to lower the truck. I'm leaning towards flipping the axle to mount on top of the springs, but there doesn't seem to be enough clearance with the frame to do this. Will I need to c-notch the frame if I go this route?
Secondly I found something you guys might find interesting. These lowering blockes are adjustable, and may be just the ticket to centering the wheel in the fender opening. It certainly would be the easiest solution to the problem that I have come across.
http://www.speedwaymotors.com/xq/aspx/display_id.2153/qx/Product.htm
