At 160K the shocks may be more or less OK or may be totally useless - my D4s only last around 60K where I drive. My D4's air-springs had significant internal cracks on the folds at 90K so got replaced at that time but the cracks may have been worse than most in line with the shorter than usual shock life.
How are the sway bar bushes? They can clunk over bumps when worn but not so much on smooth roads so you might not notice any noise. They don't have to be worn much to allow noticible sideways roll.
The cross-link valves are unlikely to be stuck open because if there's dirt in the system then the corner valves that get a lot more use are more likely to stick which would show-up as levelling problems. A cross-link valve stuck open may cause problems trying to adjust the height of those 2 corners as both corners would be adjusted together rather than individually when levelling on uneven ground.
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
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