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2003 Malibu VLX knocking sound only in forward and reverse

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I deleted my last post on accident not to computer savvy I guess. Anyway thanks for the info for those who have posted. ROFF thanks for the videos I will pull that apart tonight. The knocking sound is only happening when in gear in neutral all is great engine purrs like always even reving it up sounds great. The noise started out light knocking but got worse. Checked so far is the propeller is tight and the rudder is not making the noise also made sure the coupler bolts and set screw were tight but I am taking that apart tonight to see if the shaft nut has backed out as ROFF said and will check shaft alignment then also. Thanks for any help or ideas from anyone. A few mentioned damper plate and one said V Drive ujoints I will check these when I can. I can’t seam to post a video only a picture I guess. 


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