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Cobra Forums
2013-14 Shelby GT500
Rear gears
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<blockquote data-quote="Catmonkey" data-source="post: 16205487" data-attributes="member: 124025"><p>Ford had a 3.90 gear set for the 9", which was a fairly popular ratio on the 60-70s muscle cars. I don't think they ever made one for the 8.8. On the other hand, I don't believe Ford offered a 3.73 gear set in a production vehicle for the 9" either. They're only 5% different, which is hardly enough difference to justify replacing one for the other. But for someone that thinks 4.1 is too much and 3.73 is not enough, it is between those ratios. I hear lots of complaints over 3.73 gears whining on these cars. I just don't think 4.10s are too much gear unless you're running a rear tire diameter less than 27". But they would be a bit much with the 2.97 first gear on the 07-12 transmission.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 16205487, member: 124025"] Ford had a 3.90 gear set for the 9", which was a fairly popular ratio on the 60-70s muscle cars. I don't think they ever made one for the 8.8. On the other hand, I don't believe Ford offered a 3.73 gear set in a production vehicle for the 9" either. They're only 5% different, which is hardly enough difference to justify replacing one for the other. But for someone that thinks 4.1 is too much and 3.73 is not enough, it is between those ratios. I hear lots of complaints over 3.73 gears whining on these cars. I just don't think 4.10s are too much gear unless you're running a rear tire diameter less than 27". But they would be a bit much with the 2.97 first gear on the 07-12 transmission. [/QUOTE]
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2013-14 Shelby GT500
Rear gears
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