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As others have mentioned check the alignment, especially caster with the recent lift. It could have caused the axle to rotate (pinion pointed up more?) This will cause the truck to dart from side to side and follow things like raised paint lines etc. If you go with larger tires you can generally get away with a little more caster than stock. It can be a little bit harder to steer but you have better "return to center". You may be limited by the your pinion angle though.
You could also check the wheel bearings and trunion bearings. Jack the tire off the ground and see if there is any play from top to bottom, etc. A little less likely considering the symptoms.
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