<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">I would add something to Jon’s response. <div><br></div><div>Is the damper weight still attached to the diff extension? That’s the triangular thing mounted with three rubber pucks. Check that and the extension mount as the final drive can easily set up harmonic vibrations just as you describe. In fact that’s probably what destroyed the drive train on the Group 2 race car at Nuremberg ring in the 70’s. </div><div><br></div><div>S- </div><div><br></div><div><div dir="ltr">Sent from a small screen, please excuse any typos. </div><div dir="ltr"><br><blockquote type="cite">On Jun 12, 2024, at 11:39, Jon Stanley via Rovernet <rovernet@rovernet.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="Generator" content="Microsoft Word 15 (filtered medium)"><style>@font-face { font-family: "Cambria Math"; }
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div.WordSection1 { page: WordSection1; }</style><div class="WordSection1"><p class="MsoNormal">Lance,</p><p class="MsoNormal">I had a very similar sideways vibration on an older Jeep truck driving 55-70mph and the culprit was an out of balance driveshaft. </p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">I would suspect your driveshaft isn’t balanced. Could be because balancing weight rusted or flew off or shaft got kinked from a speed bump.</p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">Jon</p><p class="MsoNormal"><o:p> </o:p></p><div style="mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal" style="border:none;padding:0in"><b>From: </b><a href="mailto:rovernet@rovernet.org">Lance La Certe via Rovernet</a><br><b>Sent: </b>Wednesday, June 12, 2024 10:04 AM<br><b>To: </b><a href="mailto:rovernet@rovernet.org">Rovernet</a><br><b>Cc: </b><a href="mailto:lacpsyd6@msn.com">Lance La Certe</a><br><b>Subject: </b>[Rovernet] Vibrations galore</p></div><p class="MsoNormal"><o:p> </o:p></p><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Some of you may remember "Magic Fingers" vibrating beds in 1960s motels? Well, that cost 25 cents for 15 minutes. In my '70 P6B NADA I can get this for free between 60mph and 68mph for as long as I want.<o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Some background. 6-7 years ago I retrofitted a Celica Supra 5 speed manual to the car. It instantly transformed that V8 into a proper beast (relatively speaking of course). The modification also required a new propellor shaft which was supposedly balanced.<o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">I never take particularly long drives in my garage queen, and rarely 'open her up'. Nonetheless, I was on the interstate the other day and noticed significant vibration through the car at anything over 60 mph. If I pushed it past 70 mph then the vibration abated.<o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Would really appreciate any diagnostic help<o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p></div><div id="Signature"><div><p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:black;background:white">Lance </span><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:#C82613"><o:p> </o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:black;background:white">Pastafarian</span><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:black;background:white">AKA, Hoof Hearted</span><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p></div><div><p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p></div><div><p class="MsoNormal" style="background:white"><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:black">First Law of Debate: Never argue with a fool --- people might not know the difference.<o:p></o:p></span></p></div><div><p class="MsoNormal" style="background:white"><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p></div><div><p class="MsoNormal" style="background:white"><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p></div><div><p class="MsoNormal" style="background:white"><span style="font-size:14.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p></div><div><p class="MsoNormal"><span style="font-size:10.5pt;font-family:Roboto;color:#0F0F0F"><o:p> </o:p></span></p></div></div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p><p class="MsoNormal"><o:p> </o:p></p></div>
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