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While longer gears may keep you in a certain RPM range longer you have to think about torque multiplication being reduced in the process. If you are making 139 lb/ft of torque from 6000 to 8000 RPM and your are multiplying it with a 3.00:1 and a 4.765 final drive you are putting 1987 lb/ft to the wheels. If you have 3.00:1 and a 3.765 final drive you put 1570 lb/ft to the wheels. That's a hell of a difference.
In short longer gears reduce the amount of torque delivered to the wheels from the engine. It would definitely hurt the ability to accelerate your car from a stock/na standpoint. If it were boosted then longer gears would help with traction due to the engine making more torque and less torque reaching the wheels but making it useable. Either way it's a trade off and finding the best compromise of everything.
The gears in our xmsn are just fine for what they were intended to do.
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