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Limited Slip differential?

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  #1  
Old 01-23-2009, 05:04 PM
zoom2811 zoom2811 is offline
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Question Limited Slip differential?

How can i tell if my truck has a limited slip differential.The sticker in my glove box just says that i have 3.92 gears and nothing else.And what are the advantages of having a LSD?(Sorry,I'm a noob)
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Old 01-23-2009, 05:07 PM
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LSD =Boom

Seriously, they break notoriously.
Better traction 2 wheel grip vs one wheel peel.
Open diff(one wheel peel) is actually better in the snow. You don't slide sideways as the LSD tends to do

I'm in the midst of getting a Detroit carrier in my diff and replacing my stock LSD
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Old 01-23-2009, 07:00 PM
lharrell79 lharrell79 is offline
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If you want to know if you have one:

1. Back your truck out into the street.
2. Press on the brakes.
3. Now press on the gas.
4. Once the rear tires start smoking real good, let off the brake.
5. Go back and observe the tire marks.

1 skid mark most likely means you have no LSD. 2 skid marks most likely means you have an LSD.

Or you could read the tag on your rear diff, and post what it says in this thread. We could probably tell from that.

Lucas
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Old 01-23-2009, 07:02 PM
lharrell79 lharrell79 is offline
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I forgot to mention, like DirtyDog said, if you here a loud BOOM while performing the test above; then it's pretty safe to say you used to have an LSD.

Lucas
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Old 01-23-2009, 07:06 PM
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I have to disagree. I have two Rams, one LSD and on open. The LSD feels so much better off road, on wet pavement, and snow. I dont know how you can say open is better for snow as you will not slide sideways. lol LSD only kick in when you start sliding sideways or are losing grip to one tire. IF you dont believe me argue your point to the guys at offroad international or torsion. Limited slip is second best option for traction and sliding only to lockers.
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Old 01-23-2009, 07:32 PM
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Originally Posted by 06CountryBoy5.7 View Post
I have to disagree. I have two Rams, one LSD and on open. The LSD feels so much better off road, on wet pavement, and snow. I dont know how you can say open is better for snow as you will not slide sideways. lol LSD only kick in when you start sliding sideways or are losing grip to one tire. IF you dont believe me argue your point to the guys at offroad international or torsion. Limited slip is second best option for traction and sliding only to lockers.
Actually LSD's are better than lockers in sliding situations. I can't even begin to count how many times I used to end up sideways in the middle of an intersection when it was wet outside. This was caused strictly by the rear locker. The LSD is much more forgiving on wet and snowy streets.

Lucas
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Old 01-23-2009, 07:41 PM
dodgeorgethit dodgeorgethit is offline
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Anti spin is just clutch plates crammed behind the spider gears in the rear end...a s sucks when slippery or snow.. The only time the cluches break free is on hard pavement, and even then its jerky
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Old 01-23-2009, 07:58 PM
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Originally Posted by dodgeorgethit View Post
Anti spin is just clutch plates crammed behind the spider gears in the rear end...a s sucks when slippery or snow.. The only time the cluches break free is on hard pavement, and even then its jerky
my lsd kicks in on mud too. and i messed up my original post lockers are not good for sliding lol they are death in ice
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Old 01-23-2009, 09:18 PM
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unless your job is to work on rear diffs for a living, then open is never better than LSD!!! EVER.
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Old 01-23-2009, 09:36 PM
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Originally Posted by 6 hemi ram View Post
unless your job is to work on rear diffs for a living, then open is never better than LSD!!! EVER.

As stated before, open diff are better in the snow for the simple reason that the truck will run in a straight line instead of sliding sideways. if you think that both wheels don't spin when the gas is punched and on a slick surface then your sadly mistaken.
If you take 2 of the identical trucks, one has an open carrier and one has an LSD. Put them in 4wd and drive down the road. The open carrier will allow the truck to turn better and track straighter! Guaranteed! I'm not saying it will get better traction, obvioxuly one wheel vs 2 is a no brainer, but for safety reasons, an open carrier is always better in inclimate weather!
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Old 01-23-2009, 11:39 PM
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Originally Posted by 6 hemi ram View Post
unless your job is to work on rear diffs for a living, then open is never better than LSD!!! EVER.
+1 Confucius say :One legger leave you stranded!!
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Old 01-24-2009, 12:11 AM
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no, one leg is not better than two. if you slide then, then let some air out of your tires. otherwise the more the merrier. as far as wheels go.
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Old 01-24-2009, 12:15 AM
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Originally Posted by 6 hemi ram View Post
no, one leg is not better than two. if you slide then, then let some air out of your tires. otherwise the more the merrier. as far as wheels go.

You guys have no idea what i am trying to explain nor understand! It's a Proven concept that any LSD or locker does worse in bad weather! WTF. Not to mention I have owned both and driven both. And no it's not my foot that has a problem. Going around turns say on an entrance ramp, you have to hit the gas to get moving. Instead of one wheel spinnin in the snow and you maintaining control...If you have LSD or a locker both wheels spin and you can lose control. Got it!
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Old 01-24-2009, 12:26 AM
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look, if you have one tire gabbing in the rear or two and then one or two in the front then the more the merrier. sure one track will keep you/ from sliding but the more traction you have the better you are getting stuck. the more wheels moving the better you are gettin home.. never is an open diff better than a LSD or locker than an open i dont care what you think.
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Old 01-24-2009, 09:56 AM
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Originally Posted by dirtydog View Post
You guys have no idea what i am trying to explain nor understand! It's a Proven concept that any LSD or locker does worse in bad weather! WTF. Not to mention I have owned both and driven both. And no it's not my foot that has a problem. Going around turns say on an entrance ramp, you have to hit the gas to get moving. Instead of one wheel spinnin in the snow and you maintaining control...If you have LSD or a locker both wheels spin and you can lose control. Got it!
I understand you completely Dog. It's hard to explain it unless you've experienced it first hand.

In lamens terms, when driving on slick roads, and turning, if both tires in the rear are turning at the same speed, you're screwed. The rear end will come sliding around like somebody has a tow strap hooked up to you and is pulling your rear sideways. Think of it as unintentional drifting. You don't even have to try, and your rear end comes drifting around the corner.

Lucas
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Old 01-24-2009, 10:11 AM
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Quote:
Originally Posted by lharrell79 View Post
I understand you completely Dog. It's hard to explain it unless you've experienced it first hand.

In lamens terms, when driving on slick roads, and turning, if both tires in the rear are turning at the same speed, you're screwed. The rear end will come sliding around like somebody has a tow strap hooked up to you and is pulling your rear sideways. Think of it as unintentional drifting. You don't even have to try, and your rear end comes drifting around the corner.

Lucas
exactly! hence the invention of the Limited Slip Differential! It don't kick in until you've started to lose control.
Lockers in daily drivers = Bad, LSD = Good!

I really can't think of any situation where anyone could convince me I'd want an open differential over a good quality LSD. And I've driven all over, both on and off-pavement from the mountains of central N.Y. to the swamps of Florida...
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Old 01-24-2009, 10:32 AM
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Quote:
Originally Posted by zoom2811 View Post
How can i tell if my truck has a limited slip differential.The sticker in my glove box just says that i have 3.92 gears and nothing else.And what are the advantages of having a LSD?(Sorry,I'm a noob)
If it doesn't mention "anti-spin..." it likely doesn't have LSD. However, a safer test is to put one rear wheel on something slippery (wet grass, sand, etc.) and goose it. If it moves out, you have LSD. If not, it's a peg-leg.
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Old 01-24-2009, 10:47 AM
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LSD does not kick in until the wheel starts to spin. Are you guys confusing it with a fully lock locker? Hands down I will take LSD over open in any weather in the rear.

Now in my Jeep I love being fully locked but i use it very differently and would not recommend it bad weather on highway.
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Old 01-24-2009, 11:29 AM
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Detroit Tru-Trac=best of both worlds.
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Old 12-07-2011, 11:51 PM
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Guys, dirtydog's got it right. I think everyone agrees that they'd take the LSD when stuck in deep snow. The more wheels spinning, the more likely something will grip.

At speed it's another story though. A spinning tire by definition it has *no* traction. It has no resistance to being moved forward, back, or sideways because it isn't gripping the surface. If only one rear tire starts spinning on water or ice then the truck will keep tracking straight because the other tire has traction and can resist any sideways force. But if both rear tires start spinning then the rear end will come around as soon as something imparts a sideways force on the back of the truck. Like lharrell said it usually happens when the front wheels are gripping (they're weighted) so they start a turn and the rear end snaps right around.

Don't get me wrong, my truck has the LSD because I don't want to be stuck plowing. But a truck with an open diff is less likely to spin around on an unsuspecting driver.
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Old 12-07-2011, 11:51 PM
 
 
 
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