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Montana3661rl, popping noises come from the hydraulic fluid in the system reacting to temperature changes which is coupled via the aluminum leveler rams. See the lippert website about the issue. I also used the cat fluid with great success.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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