5.5 deg of caster to much?
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Since there's a trade off between pinion angle and caster, you may get driveline vibrations with 5.5 or you may not. You won't know until your control arms are installed and you drive the jeep. For this reason, I'd recommend getting adjustable control arms. That way you can dial in the caster and adjust as needed.
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I'm running 6 deg caster. PR44, also Coast drive shafts, adjustable control arms. Spending money on fixed control arms is a waste. You may not want to change your height but you'll have spring sag and no way to compensate for that. You have fixed length stock, why spend money on some more.