<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">I would not call LR a high speed track. In the GT6, I do not hit redline in 4th on the front straight with a 3.89, and no-name straight is much shorter. Not sure how that compares for your car - the engine does run to 7,300 RPM, but I also only have 13” wheels. For me, with a close ratio TR6 box, it’s mostly a third gear track except on the front straight.<br id="lineBreakAtBeginningOfMessage"><div><br><div>On Jun 2, 2025, at 12:15 PM, Dave Riddle via Fot <fot@autox.team.net> wrote:</div><br class="Apple-interchange-newline"><div><meta charset="UTF-8"><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Verdana-Bold; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0in; font-size: 12pt; font-family: Calibri, sans-serif;"><span style="font-size: 11pt;">Lime Rock is a high speed Track so does the collective FOT wisdom think a 3.7 or 4.1 rear end would be best in a TR4?<o:p></o:p></span></div><div style="margin: 0in; font-size: 12pt; font-family: Calibri, sans-serif;"><span style="font-size: 11pt;"><o:p> </o:p></span></div><div style="margin: 0in; font-size: 12pt; font-family: Calibri, sans-serif;"><a href="http://www.microworks.net/"><span style="font-size: 11pt; color: blue; text-decoration: none;"><span id="cid:image001.jpg@01DBD39E.E9BA0F20"><image001.jpg></span></span></a><span style="font-size: 11pt;"><o:p></o:p></span></div><div style="margin: 0in; font-size: 12pt; font-family: Calibri, sans-serif;"><b>Dave Riddle<o:p></o:p></b></div><div style="margin: 0in; font-size: 12pt; font-family: Calibri, sans-serif;"><span style="font-size: 11pt;">Business IT Consulting<o:p></o:p></span></div><div style="margin: 0in; font-size: 12pt; font-family: Calibri, sans-serif;"><span style="font-size: 11pt;">Office: 480.610.8234<o:p></o:p></span></div><div style="margin: 0in; font-size: 12pt; font-family: Calibri, sans-serif;"><span style="font-size: 11pt;">Cell: 602.692.5276<o:p></o:p></span></div><div style="margin: 0in; font-size: 12pt; font-family: Calibri, sans-serif;"><span style="font-size: 11pt;">eMail:<span class="Apple-converted-space"> </span><a href="mailto:dave@microworks.net"><span style="color: blue;">dave@microworks.net</span></a><o:p></o:p></span></div><div style="margin: 0in; 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