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Cobra Forums
2013-14 Shelby GT500
3.73 vs. 4.10
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<blockquote data-quote="Jam421" data-source="post: 16636274" data-attributes="member: 110985"><p>Please correct me if I'm wrong on stock tire height....it's been a few years !</p><p>When I did the math for my 305x35x20 MT DR at 28.7"OD ....given stock tire height at 27", with the taller MT 4.10's actually converted to 3.86 rear gear ratio. I'd imagine this ratio may increase if tire psi is much lower than recommended? I run my MT's at 21psi on the street....so I'd guess it may be closer to 3.90's. When I had 3.73's ( 2sets) out back the converted ratio was a 3.51 rear gear. ut eventually they whined. 4.10's for 4 yrs ...no whine.</p><p></p><p>See: " Effective Gear Ratio With New Tire Size"</p><p><a href="http://www.wallaceracing.com/gearcalc1.php" target="_blank">Wallace Racing - Gear/Speed Calculator</a></p></blockquote><p></p>
[QUOTE="Jam421, post: 16636274, member: 110985"] Please correct me if I'm wrong on stock tire height....it's been a few years ! When I did the math for my 305x35x20 MT DR at 28.7"OD ....given stock tire height at 27", with the taller MT 4.10's actually converted to 3.86 rear gear ratio. I'd imagine this ratio may increase if tire psi is much lower than recommended? I run my MT's at 21psi on the street....so I'd guess it may be closer to 3.90's. When I had 3.73's ( 2sets) out back the converted ratio was a 3.51 rear gear. ut eventually they whined. 4.10's for 4 yrs ...no whine. See: " Effective Gear Ratio With New Tire Size" [URL='http://www.wallaceracing.com/gearcalc1.php']Wallace Racing - Gear/Speed Calculator[/URL] [/QUOTE]
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2013-14 Shelby GT500
3.73 vs. 4.10
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