Technically, WD40 is a solvent, not a lubricant. Probably cleaned out some dirt/gunk in the bushings. Be prepared for it to get noisy again--if it does, get a quality spray lube and use it instead. Just my thoughts, it may never make noise again...
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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