<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">I’ve had a very similar issue from the first time I drove my ’62 Spitfire down the front straight at TWS and on both straights at COTA.</div><div class="">Mine is more of a rumble that seems to start when I’m going flat out in fourth around 5-6K rpms.</div><div class=""><br class=""></div><div class="">I have had the drive shaft balanced and phased, swapped gearboxes, diffs and still it’s there.</div><div class="">My gearbox tail shaft has a strap going over it to help secure it in place. </div><div class="">To me it feels like something in the rear. I was wondering if I had a wheel out of true or tire out of round.</div><div class="">Two things I haven’t swapped out.</div><div class=""><br class=""></div><div class="">Another thing I notice was one of my trailing arms, I can move with my hand and the other I can’t. </div><div class="">They are heim joints. Was thinking maybe a toe out/in issue?</div><div class=""><br class=""></div><div class="">Could be the diff mounts as well, haven’t changed them out.</div><div class=""><br class=""></div><div class="">Don</div><div class=""><br class=""></div><br class=""><div class="">
<div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;">DON COUCH PHOTOGRAPHY<br class=""><a href="http://www.dcphotos.com" class="">www.dcphotos.com</a><br class="">(512)-680-3540</div>
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