As promised checking in after getting it back from the shop. The rear U joint was frozen. While it was rapidly moving toward total failure, there was no play in it! Upon removal and dismantling, one of the four yokes was so devoid of grease that it was corroded to a dark rusty brown and the...
New member here...
My 68K 2008 LZT has developed a high frequency vibration that occurs between 72 and 79 MPH and which is accompanied by a "rumbling" which is at the same frequency and that can be felt (and ever so slightly heard). The vibration is not present below or above that speed...
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