Intermittent lower end knock

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Brandon67e

TYF Newbie
Joined
May 31, 2017
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Hello All,
I am new to the group. I just bought an 07 Tahoe with the 5.3 and 165K miles. I noticed shortly after getting it that i would hear a slight knock in the lower end. After more observation it seems to come and go. I cant find any ryhme or reason for it coming and going, but the sound is pretty pronounced. Im concerned about this because it sounds bad. I wouldnt think it would come and go if it were a rod knocking. Any ideas?
 

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