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Is this for a V6, or V8?
My guess would be on the top end you would increase by a few hundred rpms only. So without doing any math if your car does, for example, 1900 rpms at 65mph it might do something like 2200rpms, in 6th gear, at 65mph. That is merely an educated guess. Not a very big sacrifice honestly to go taller and probably only minimal impact to the overall driveability and economy, but you would see more torque for sure. Which do you have now? 3.27? It would help to know from what starting point you are at if we are going to include math into it.
As far as I can remember, since I haven't had to refer to this recently, the M6 SS has a 3.45. But I can't remember if the automatics have the same rear end or not. Can someone confirm? In general automotive terms, typically automatic cars use a slightly taller rear end to make up for the gearing ratios in auto transmissions. So I'm curious if there is another variant rear end available.
That said, 3.70 sounds sick! My M6 SS is already torquey as hell with the 3.45, being able to pull from any gear at low rpms. I can literally take off in 3rd gear with no issues.
3.70 would make it snappy as hell off of the starting line. Given that most people don't average much over 100mph, a 3.70 would obviously shave a bit off the top end but with the power band and range this car has it would make for a great street racer or 1.4 mile car.
You got me curious now how this would perform, and dyno, moving to a taller gear in an M6..... so not to hijack OPs question I'd be curious to hear about any experiences with anyone running 3.70 in either both auto or manual...
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