Originally Posted by bobjenkins
someone already posted im sure a good in depth answer but heres my understanding and Im not very knowledgible
the gears in the differential are the ratio of driveshaft to wheels
3.73 gears - 3.73 to 1
the driveshaft spins 3.71 times for every one time the wheel spins
in a way its about torque
look at a winch, the ratio is somerthing like 300 to 1
when the engine/motor is spinning more/faster than the wheels you will have more torque
another expample is manual transmission
you have less torque in 5th gear because the ratio is closer to 1 to 1 then say in 1st gear
that's not bad for someone unknowledgeable.
99% of the time when we talk about gears, we're talking about Ring and Pinion. these gears are located inside the differential, located near the center of an axle.
they are one of the many links that help transmit power from the engine. these components make up the Drive Line. power from the engine goes to the transmission, then driveshaft, then gears. the driveshaft rotates a pinion, that in return spins a ring gear. this then makes axle shafts turn, and making the wheels spin.
we change the gears sometimes during upgrades to big tires. big tires are heavy, and create alot of resistance. this means we need more power to turn them. so we tramp on the gas more. this kills MPG, and makes a jeep feel underpowered.
to correct this, we install lower gears. the drive shaft spins faster, but we don't need to hammer the gas down. lower gears "make better use of the power received by the driveshaft. as an added bonus or welcome side effect, more torque is created to move the large tires.
I hope this answer is what you're looking for.