Is it a hard jerk and/or a large jump? Or just that it takes some correction? It's a lifted solid axle vehicle, it's not going to drive like an IFS car or SUV.
Could do the quick steering wheel wiggle test - have someone rock the steering wheel back and forth while parked on pavement and see what (if anything) moves.
I am also pretty sure the Timberline 4 link arms are adjustable, take a look at caster too.
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'06 EB 350, Advanced 4x4, 6.7 Cummins + Allison, 24" bubble top.
'05 Pleasure Way Excel TS V10, still boring and 2wd
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