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Old 05-13-2012, 08:16 AM   #1
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Re; Why Is It Called A 4X4?

Why is my Jeep called a 4X4? this designation used to refer to the differentials, or the number of drive whells, and the number of gears in the transmission. So, if this is still the case. My Jeep Wrangler is a 5X4!!!!

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Old 05-13-2012, 08:29 AM   #2
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nope.

first designation is number of powered wheels second designation is total number of wheels

toyota cellica = 2x4
jeep wrangler = 4x4
soccer mom jeep = 2x4 and yes im including the 2wd jku

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Old 05-13-2012, 09:29 AM   #3
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Originally Posted by lee indy View Post
nope.

first designation is number of powered wheels second designation is total number of wheels

toyota cellica = 2x4
jeep wrangler = 4x4
soccer mom jeep = 2x4 and yes im including the 2wd jku
Light Armored Vehicle (LAV) = 8x8
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Old 05-13-2012, 12:03 PM   #4
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Two-wheel drive vehicles are actually 'one wheel drive' and Four-wheel drive vehicles actually have two wheels driving (one on each axle) UNLESS the vehicle has limited slip differentials. 2 X 4 and 4 X 4 is a misnomer for vehcles without limited slip differentials.
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Old 05-13-2012, 12:38 PM   #5
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Originally Posted by URascal View Post
Two-wheel drive vehicles are actually 'one wheel drive' and Four-wheel drive vehicles actually have two wheels driving (one on each axle) UNLESS the vehicle has limited slip differentials. 2 X 4 and 4 X 4 is a misnomer for vehcles without limited slip differentials.

That is false information.
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Old 05-13-2012, 01:18 PM   #6
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Originally Posted by URascal View Post
Two-wheel drive vehicles are actually 'one wheel drive' and Four-wheel drive vehicles actually have two wheels driving (one on each axle) UNLESS the vehicle has limited slip differentials. 2 X 4 and 4 X 4 is a misnomer for vehcles without limited slip differentials.
Source this garbage please. When both tires on the same axle have equal down pressure, they push the same amount of power each. This goes for the front and rear axle.
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Old 05-13-2012, 01:22 PM   #7
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Source this garbage please. When both tires on the same axle have equal down pressure, they push the same amount of power each. This goes for the front and rear axle.

Correct. And even without equal pressure, both tires have equal power. The power to both is limited by the tire with the least amount of friction/pressure.
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Old 05-13-2012, 01:22 PM   #8
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That is the wrongest thing.. I've ever heard ever.. And i've heard stuff lol
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Old 05-13-2012, 01:37 PM   #9
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How many tires are receiving power = 1st number
How many tires = 2nd number

One axel delivering power to 2 wheels on a 4 wheel vehicle = 2x4
2 axels delivering power to 4 wheels = 4x4
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Old 05-13-2012, 01:41 PM   #10
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Sooo much.....false information...intake.....ugh thank you golden for saving that guys post hahaaa
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Old 05-13-2012, 01:56 PM   #11
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Quote:
Originally Posted by Austerlitz View Post
How many tires are receiving power = 1st number
How many tires = 2nd number

One axel delivering power to 2 wheels on a 4 wheel vehicle = 2x4
2 axels delivering power to 4 wheels = 4x4
That's the right and simplified explanation, having LSD/lockers and traction factors are not related to this description.

Some people differentiate them by "normal 4x4" and "true 4x4" this is not an official naming for the 4 wheel drive system. "true 4x4" is when you have have power on all 4 wheel even if you lose traction, like with front and rear lockers.
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Old 05-13-2012, 02:03 PM   #12
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You always have power unless you have 0 traction, aka one wheel in the air. But lockers make your net force between the two wheels equal to whatever the force what with equal pressure. Same thing you said Tlate, just clarifying it for anyone who reads this.

Open Diff:

LT RT
50-50 with equal traction

10-10 loss of traction to the right tire

00-00 Tire in air


Same scenario with a locked diff

LT RT
50-50 with equal traction

90-10 loss of traction to the right tire

100-00 Tire in air

It doesn't work perfect like that, but thats a basic explaination. your axle shafts (axles) act like torsion bars. When one doesn't spin in the open diff, there is no torsion on the other. In a locking diff, the sides are "split up" the power, so all the torque goes to the other side that isn't going to the side that lost traction.
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Old 05-13-2012, 02:15 PM   #13
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Something not many people understand is that an open or LSD-equipped differential always (ALWAYS!) splits the power 50:50 equally to both sides. It doesn't matter if one tire has perfect traction and the other has zero traction, the available torque always gets split 50:50 between the left and right sides.

One side never gets all the power, both sides always get an equal share. Always. The key to understanding why that may not appear to be the case to some is talked about in the two below articles I wrote years ago. The key is that in reduced traction situations, the axle can deliver no more torque than it takes to start the tire with the least traction spinning. Once one tire starts spinning, the available torque that is split 50:50 is reduced so much that the side that still has traction isn't getting enough torque to keep you moving.

4x4 & Torque answers

And if you want a little different take on it...

What? Why do I need a locker? I thought I had 4WD!
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Old 05-13-2012, 02:27 PM   #14
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Jerry is the only one who had the key word and that is torque. Your differential ALWAYS splits torque 50/50, no matter open, limited slip, or locked.
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Old 05-13-2012, 02:35 PM   #15
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Jerry is the only one who had the key word and that is torque. Your differential ALWAYS splits torque 50/50, no matter open, limited slip, or locked.
And how does one develop torque?
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Old 05-13-2012, 02:46 PM   #16
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And how does one develop torque?
Any kind of resistance. If you have a wheel in the air you've probably got a foot pound of torque from bearings and other drivetrain frictions. Which is split equally, but obviously that's not going to get you anywhere. Open diff obviously. In a limited slip resistance comes from clutch packs and locked resistance comes from your other tire if it has traction.
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Old 05-13-2012, 03:05 PM   #17
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your axle shafts (axles) act like torsion bars.
For those that do not know what a torsion bar is I will explain. They are 3-6 inch thick literally bars that are usually a good four to six feet long, with a lever connector that instead of a spring twists the bar. The length and width of the bar depends if it is a main battle tank, light recce tracked vehicle or something in between. In the UK we have a trusted vehicle called the Warrior. I managed to break 2 of these tempered steel torsion bars buy getting the warrior I was driving airborne.

Just saying
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Old 05-13-2012, 03:49 PM   #18
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Two-wheel drive vehicles are actually 'one wheel drive' and Four-wheel drive vehicles actually have two wheels driving (one on each axle) UNLESS the vehicle has limited slip differentials. 2 X 4 and 4 X 4 is a misnomer for vehcles without limited slip differentials.
I didn't make myself clear. I was speaking about a situation where you don't have traction with one wheel and you don't have limited slip differentials. Even though you have power to both wheels, you "effectively" only have power to one wheel because that wheel is spinning and you ain't going anywhere.
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Old 05-13-2012, 04:43 PM   #19
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Any kind of resistance. If you have a wheel in the air you've probably got a foot pound of torque from bearings and other drivetrain frictions. Which is split equally, but obviously that's not going to get you anywhere. Open diff obviously. In a limited slip resistance comes from clutch packs and locked resistance comes from your other tire if it has traction.
Thank you. Without resistance, there is no torque, no torque = no forward movement. In other words, with an open diff that splits the torque from the engine ALWAYS 50/50, if one wheel has no resistance, then the other side will see it's half of the developed torque which is zero.
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Old 05-13-2012, 04:44 PM   #20
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Any kind of resistance.
And the more resistance the engine is working into, the more torque it develops. Which is why when a wheel starts spinning, the amount of torque the engine develops drops to the amount required to spin the wheel. Which means very little torque is being generated and what little is being generated is being split 50:50 between the left and right tires. So that small amount going to the side that isn't spinning isn't enough to turn that side... but it is enough to spin the tire with less or no traction.
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Old 05-13-2012, 04:52 PM   #21
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And the more resistance the engine is working into, the more torque it develops. Which is why when a wheel starts spinning, the amount of torque the engine develops drops to the amount required to spin the wheel. Which means very little torque is being generated and what little is being generated is being split 50:50 between the left and right tires. So that small amount going to the side that isn't spinning isn't enough to turn that side... but it is enough to spin the tire with less or no traction.
Yeah, but the good news is that the tire in the air gets to spin twice as fast as normal for that engine RPM.
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Old 05-13-2012, 04:59 PM   #22
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Yeah, but the good news is that the tire in the air gets to spin twice as fast as normal for that engine RPM.
Precisely twice as fast.
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Old 05-13-2012, 06:41 PM   #23
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Here's some decent info/explaination about how differentials work.


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Old 05-13-2012, 07:40 PM   #24
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if you stop reading at post 2 this thread isnt crap. but pile on all the hypothesis and crap info and this thread sucks
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Old 05-13-2012, 08:01 PM   #25
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Here's some decent info/explaination about how differentials work.


Thanks for sharing this Lindel, to us non mechanical guys, this was great info, on how a differential works. I personally did not know that, in depth..
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Old 05-13-2012, 08:26 PM   #26
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Did we really have to hash this out 17 more times? lol...
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Old 05-13-2012, 08:34 PM   #27
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25 more times

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