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Old 07-16-2010, 12:47 PM   #1
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Can anyone explain gears?

Im new to the off road scene and wranglers in general. I have no idea what gears actually do or what is changed when upgraded... i could use a simple explanation on the subject...
Thanks for the info in advance...

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Old 07-16-2010, 01:56 PM   #2
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Old 07-16-2010, 02:43 PM   #3
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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
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Old 07-16-2010, 08:54 PM   #4
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Quote:
Originally Posted by bobjenkins View Post
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.
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Old 07-17-2010, 08:08 AM   #5
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I would say they pretty much summed up the answer your looking for.. good question by they way, people here are glad to help.
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Old 07-17-2010, 10:48 AM   #6
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Lower gears (numerically higher, like 4.10 or 4.56) increase the effect of "torque multiplication". Your engine produces a certain amount of power, and upgraded gears allow the engine to do more work with less effort. The gears "multiply" the amount of torque being transmitted through the drivetrain.

Let's say you have a set of 3.23 gears and a set of 4.10s. The 3.23s do not multiply torque as much as the 4.10s, meaning the vehicle will not accelerate as quickly (either from a stop or while moving). The 3.23s will have better gas mileage (assuming you're not going WOT all the time) and have a higher top speed in each gear. 4.10s, on the other hand, will allow the vehicle to accelerate quicker because they multiply torque more. They will get worse gas mileage and a lower top speed in each gear.

How does this all practically relate to off-roading? Lower gears (4.10s, etc.) will multiply the power output, allowing you to make climb that hill or get through that deep mud. They also compensate for larger tires. When you increase the size of the tire, you increase its circumference and therefore the distance traveled with every revolution of the wheel. This is almost like having a higher gear. Also, larger tires often weigh more, making it harder for your drivetrain to turn them. Having lower gears compensates for this.
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Old 08-01-2010, 11:08 PM   #7
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Wow... I knew absoutly nothing about gears, now after reading all your replies, i feel like im the expert now..ha.. Thanks everyone a ton, big help!
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Old 08-11-2010, 08:02 AM   #8
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This thread def helped me understand the ratios too. I just purchased a jeep yesterday with a 4inch lift and 33' tires. It won't hold 5th gear very well going up an incline but the rpms will still climb nice on the same incline in 4th...i need to check the ratio for sure...i have a 95 SE which looks like it would be a stock 3.07, but i am the 5th owner so hopefully someone changed it somewhere along the line...these forums really help out
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Old 08-11-2010, 08:08 AM   #9
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Great info! Thanks everyone!
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Old 08-11-2010, 01:46 PM   #10
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LaterJim you can figure your gear ratio by couting how many times you have to turn the driveshaft to get one complete turn of the tires.

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