Just Mark, have you tried adjusting the steering gear, it made a huge improvement on mine and I only adjusted the sector. When I tackle the king pins I'll have the drag link off and plan on going back through the gear adjustment. With a small amount of slop in my king pins it multiplies to a noticeable amount of movement at the top and bottom of my tires since they are about 39" in diameter.
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I'd like to do that but don't know how. Know if there's a tech tip on that here or elsewhere?"
Do you have a GMC Truck Maintenance Manual for your year truck?
