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Limited slip?

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How do I know if I have a limited slip diff? Did all these trucks come with it?

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Most came with standard diff as far as I know... If you look under the hood (on the actual hood) or in the glove box there should be a sticker stating type of driveline installed.

Jack up the rear end with tranny in neutral and turn one tire they should both turn the same way and same speed then its LS. If its jacked up put it in park or in gear if manual and turn one tire, if you can't turn it then you have a limited slip. if it turns and the other turns opposite its an open diff. This works for the clutch style ls diffs. the newer 3ed gen helical gear ls units are not as easy to pick out as they will and do act like an open diff when trying the above technique.

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Welcome To Mopar1973Man.Com LLC

We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.