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  #1  
Old 12-20-2011, 11:02 PM
LaramieV LaramieV is offline
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Default Rear diff.

So here I am, driving down the road with the wife and we're talking about the truck. I say I wonder if it has an LSD, she says go over to the shoulder and see. So I pull over to the shoulder and stop, I dump the gas and look back and see 2 nice lines in the sand and stone. So here it is, I'm with my boy and he asks me to tear one up, I hold the brake dump the gas and as I begin to spin I let off the brake. One patch. WTF? So do I have an LSD or not?
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Old 12-21-2011, 06:14 PM
sethmark sethmark is offline
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Unlikely. Here's the short course... an open differential only differentiates (allows one side to coast while the other side gets power) when one tire has greater traction than the other. With an open diff, the tire with the LEAST traction gets the power.

With a limited slip, as you apply power (generalizing for simplicity) the clutches tighten up and apply traction to both tires to a certain extent.

The easiest way to tell is jack up both tires and spin one. If you have an open diff, the other will spin in the opposite direction.

If you have mud/ice/sand put one tire on pavement and one tire on the slippery stuff. If you move without hesitation, you're sporting the limited slip.
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Old 12-21-2011, 09:42 PM
crusher crusher is offline
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thats weird

i have a sport with 3.92 gear and lsd and ive try the one wheel on black ice and the other on asphalt

i floor it and it did go forward but not that fast and i could definately feel one wheel spin,...

whats wrong is my diff broke?
or its normal
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Old 12-21-2011, 10:18 PM
sethmark sethmark is offline
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Normal. Limited slip is just that.

Hold the brake a little and the clutches bind better.
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Old 12-21-2011, 10:32 PM
LaramieV LaramieV is offline
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OK so with a NON LSD, I certainly would not have had 2 wheel spin on the gravel shoulder ?
I'm trying to get the build sheet online from Dodge but it's proving difficult for some reason. Am I correct in thinking there is someone here that can get this with the last 8 digits of my VIN ? Which of course would be; J9530792
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Old 12-21-2011, 10:44 PM
sethmark sethmark is offline
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You absolutely would have a 2 tire spin in gravel... you have relatively equal amounts of traction. An open diff isn't 1 wheel drive... equal amounts of traction gives you equal balance between tires.

Its only when there's a difference between tires traction OR tire speed (think a corner when they're not moving at the same speed) will the open diff differentiate.
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Old 12-21-2011, 11:09 PM
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you can take your VIN to the parts desk at the dealer and they will print you the data on your truck. I learned so much about my truck from that sheet. all the technical data is there including gear ratios and if your have LSD or not.
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Old 12-22-2011, 06:50 AM
LaramieV LaramieV is offline
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Thanks guys, much appreciated. Will be seeing the dealer later today. Anxious to know if LSD and gear ratio.
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Old 12-22-2011, 07:21 AM
sethmark sethmark is offline
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The other option is to register your truck to you with Dodge at

https://owners.ramtrucks.com/sub/Pages/OwnersLogin.aspx?ReturnUrl=%2f_layouts%2fAuthentic ate.aspx%3fSource%3d%252F&Source=%2F


The build sheet is under the LEARN AND USE tab.
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Old 12-22-2011, 07:24 PM
LaramieV LaramieV is offline
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3.55 gear which I'm happy about, but no LSD which sucks. Oh well.

Sethmark, that page only works for American registered trucks, but thank you just the same.
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