Unstable steering and wandering

[crawdad]

I have to admit I haven't been a chevy owner for many, many years, so I just don't know what good steering should feel like for these trucks. The steering on my truck seems to be VERY light, i.e., it wanders too much and doesn't seem to want to hold a good line going down the road. If I turn the wheel real quick, it seems to want to turn too quick, almost like it is diving to one side. The shocks, while not new, don't appear to be in bad condition. The entire fornt end could probably stand to be rebuilt, but is there any one thing that would lead to this type of behaviour more so than anything else? Thanks.