BUT, that depends on the gear ratios in the transmission, if you have gear ratios that turn the drive shaft faster, you can make up for that loss in top vehicle speed, but ratios spinning the driveshaft faster will reduce the torque.
Thats how OverDrive came around, to spin driveshafts even faster to improve engine economy or top speed of the vehicle, without having to sacrifice the torque "multiplication" of the lower gears and the axle.
Which brings you to Final Drive Ratio.
The axle ratio doesn't mean much without the ratios from the transmission. And the final drive ratio is the top gear multipled by the axle ratio.
Note: people like to talk about how the V6 has taller axle ratios, but the V6 has a different transmission, with different gear ratios for each gear, and if you were to do the math, you would find every gear, the final ratios are very close between the V6 and V8.
Don't Forget: Tire Diameter has a huge effect as well, the speed the vehicle moves per tire rotation changes with the tire diameter, so changing the tire diameter has an effect of the drive ratios, just as if you changed the axle ratio. That is why people that fit huge wheels/tires to a vehicle have to change the axle ratios or the vehicle drives like a dog.
It a linear relationship, so if you fit tires that are 10% larger in diameter, you'll see a 3.2% reduction in torque, 20% larger you'll see a 6.4% reduction, but improvements in top speed and mileage. (You may need to check my math on that, I may be wrong on the actual figures, and it actually might be worse).
And we haven't even gotten into rotational inertia.
Nor did the films get into LSD's. But basically, its NOT hard to imagine, in those films if you fit clutches inbetween the two axle, it would resist the two wheels moving at different speeds, but allow it to do so if the force was great enough to overcome the clutches, and it would also help limit the difference in speed between the two. The film didn't get into that first and simpliest "open" differentials, would sometimes let wheels spin at different speeds when you would NOT want them to do so. By limiting the slip between the two sides, you strike a compromise where you allow them to spin at different speeds when needed, but resist them spinning at different speeds when they should spin at the same speed.
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