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The caster is low for some reason... springs settled a bit? The pinion angle may be off as well and the shims may even help.

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Yeah, maybe grab a prybar and pry on the all four spring ends and see if there is play in those eye bushings. It is an old truck, they should be worn out by now? The alignment shop should have looked at them though......

Interesting that the 2Gens have the same specs, 'cuz they sure don't drive like the old ones. Way different suspension yes, but it's still pushing the same axle down the road.