That Sucks! If your truck droped 5 inches and was still drivable I am thinking that it was a torsion bar that broke or maybe one or more of the bolts on the front t-bar mount If one of the control arm bolts broke I don't think it would be as drivable? A torsion bar acts like a spring they are used instead of leaf/coil springs.
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Kevin
00' Super Black SE 5 speed
31" BFG M/T's, ARB, Rancho RSX's
superblackxterra.tripod.com