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Message: <blockquote data-quote="cobrajeff96" data-source="post: 1535832" data-attributes="member: 29141"><p>Diff type and gears can have an effect on mpg and rpm as it relates to accel & decel. A heavier package will take more horsepower to turn and is definitely a factor in 'drivetrain loss' (along with driveshaft, transmission, clutch package/torque converter, etc.). For instance, if you get the gears lightened it removes material from one of the heaviest components in the drivetrain, thereby reducing mass and thus drivetrain loss. This frees up engine power and also the car will accelerate quicker. Weight is one thing, but when it's 'powered weight' so to speak, the effect of changing it for better or worse is even more pronounced. There is essentially no downside to reducing weight from transmission reward. It's only when you dedicate the car to drag racing only that a heavier flywheel may be more desirable so that it can store a lot of energy prior to dumping the clutch (in a manual trans, that is).</p></blockquote><p></p>