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2015+ Shelby GT350 Mustang
4.09 or 4.11
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<blockquote data-quote="ANGREY" data-source="post: 16131237" data-attributes="member: 188865"><p>Guys, I guess it's all in what's "tolerable" to you for cruising rpm.</p><p></p><p>The overdrive is a healthy .63, but there's a sweet spot in terms of torque multiplication (felt) and how much % rpm change you're taking on.</p><p></p><p>In my first mustang, I had a T-45 with 3.90 gears and between that and the exhaust, cruising at 80 mph was miserable. I literally had to wear ear muffs on long trips (and every person that could actually see through the tint gave me such strange looks on the interstate).</p><p></p><p>If you don't mind whaling at 3k rpms to go with traffic on the interstate, knock yourself out. There's a point of diminishing and even negative returns with gear sizing (i.e. more gear does very little to help at some point and actually makes the car slower if you go even further). I don't know if 4.30's or 4.56's are in negative territory, but I do know that I'm not keen on making the car rev to 3k rpms just to stay with normal traffic. A 2 hour trip would be miserable.</p><p></p><p>Now, as I said earlier, if some enterprising/motivating person wanted to sell a .50 overdrive kit for the T3160 to go along with some 4.30's, then I might have been on board.</p><p></p><p>Also, as I said earlier, the felt effect of going to 4.09's is a lot more pronounced than with what most of us would consider "normal" muscle cars that have a better torque ramp up down low. 10% is more felt here because of the steep nature of the power band.</p></blockquote><p></p>
[QUOTE="ANGREY, post: 16131237, member: 188865"] Guys, I guess it's all in what's "tolerable" to you for cruising rpm. The overdrive is a healthy .63, but there's a sweet spot in terms of torque multiplication (felt) and how much % rpm change you're taking on. In my first mustang, I had a T-45 with 3.90 gears and between that and the exhaust, cruising at 80 mph was miserable. I literally had to wear ear muffs on long trips (and every person that could actually see through the tint gave me such strange looks on the interstate). If you don't mind whaling at 3k rpms to go with traffic on the interstate, knock yourself out. There's a point of diminishing and even negative returns with gear sizing (i.e. more gear does very little to help at some point and actually makes the car slower if you go even further). I don't know if 4.30's or 4.56's are in negative territory, but I do know that I'm not keen on making the car rev to 3k rpms just to stay with normal traffic. A 2 hour trip would be miserable. Now, as I said earlier, if some enterprising/motivating person wanted to sell a .50 overdrive kit for the T3160 to go along with some 4.30's, then I might have been on board. Also, as I said earlier, the felt effect of going to 4.09's is a lot more pronounced than with what most of us would consider "normal" muscle cars that have a better torque ramp up down low. 10% is more felt here because of the steep nature of the power band. [/QUOTE]
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2015+ Shelby GT350 Mustang
4.09 or 4.11
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