backspacing

if you run a search in google for backspacing, you should find some answers explaining it w/ pictures and everything or maybe even at www.tirerack.com

I'll give you the gist of it though...backspacing (also called offset) is the amount of space from the back part of the wheel (the part that goes in toward the car) and the center part that actually mounts to your rotor or spindle. The more backspacing, the more your wheel sits in the wheelwell; the less the backspacing, the more you have toward the outter fender. So a 10" wheel w/ 5.5 backspacing has 5.5" on the back side of the wheel toward the shocks and 4.5" toward the outter fender.

Quad shocks are horizontal shocks used by ford to prevent wheel hop. Many guys replace their upper and lower control arms and are able to eliminate the quad shocks. One reason to eliminate quad shocks is to allow the use of larger tires in the rear. Some simply flip the quad shocks around, which provides a little more clearance and provides the same function. If you pull a rear wheel off, you really can't miss the quad shock if you have them. They're RIGHT there