Best LSD for my 2012 2WD?

SuperBeaner · Jun 14, 2012

Also, which Limited Slip should i use? (Hyuk, Hyuk!)

I know a lot of guys are upgrading to 4.56 gears and whatnot, wht does that do to your mileage? obviously it goes down, but how much?

iSlacker816 · Jun 14, 2012

There's no gears made for the 2012's yet

SuperBeaner · Jun 14, 2012

I imagine Mopar does, considering that there were several ratios offered as stock options.

More concerned about WHAT those gears do, rather than availability. I assume after a few months there will be some aftermarket gears, just like we are waiting on a tuner.

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IGarza11 · Jun 15, 2012

SuperBeaner said:
I imagine Mopar does, considering that there were several ratios offered as stock options.

More concerned about WHAT those gears do, rather than availability. I assume after a few months there will be some aftermarket gears, just like we are waiting on a tuner.

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Mopar has up to 4.10 for the ZF axles and thats from the R/T. Anything above that your out of luck. A change of gear ratio can lower your mileage what it does is gives better acceleration and can highten your RPM's causing more gas to be burnt. Alot of people will get a lift and 35s+ and go from a 3.55 to 4.10, or 4.56 to compensate for the loss of power from the added weight which with the new hemis and the "ECO" may cause a save in mileage.

jlb · Jun 15, 2012

Actually it is possible to get better mileage with lower gears, it is really dependent on a lot of variables, primarily how quickly you like to drive while "cruising," and how close your engine is to running at optimum efficiency in terms of rpm's You can actually get better gas mileage because your truck doesn't have to pump as much fuel/run as much advance/as aggressive of a cam profile since it doesn't need to make as much power to keep you going.

I have the 3.92 gears, and I average between 19, and 20 mpg on the highway at 70mph. Stock tires (275 70 17), but I don't think I would have any power issues with a 285 70 17.

Also, generally you don't swap to those types of gear ratios to compensate for the weight so much as the larger diameter of the tire, and how it takes more torque to turn it.

SuperBeaner · Jun 15, 2012

thanks! That answers my question about gearing.

So what do I do about getting a limited slip for my ride?

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jlb · Jun 15, 2012

You are lucky in a way, since you only have to upgrade one axle lol

I don't know anything about where to get them from, but I know the 3.92 comes in limited slip form as opposed to open, and I would assume the 4.10 does too since it is on the R/T.

You probably have to order the parts from Chrysler for now, but if you are willing to wait maybe some other options will open up. Assuming of course you will do the work yourself lol.

quietpeen · Jun 16, 2012

right now a lot of new dodge owners are going through this. Big let down to want to upgrade to find that you can't do gears or tuners

SuperBeaner · Jun 16, 2012

I'll probably let a more experienced mech do the work...but thanks!

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garner · Jun 19, 2012

Best bet would be order the factory lsd from mopar

jlb said:
You are lucky in a way, since you only have to upgrade one axle lol

I don't know anything about where to get them from, but I know the 3.92 comes in limited slip form as opposed to open, and I would assume the 4.10 does too since it is on the R/T.

You probably have to order the parts from Chrysler for now, but if you are willing to wait maybe some other options will open up. Assuming of course you will do the work yourself lol.

3.92 is available as open or limited slip. Depends if you or the dealer selected the limited slip option. The R/T 4.10 are the only ones that are guaranteed to be limited slip

SuperBeaner · Jun 19, 2012

The couple that I found were over $2500! Guess I'll be waiting for a bit. Most likely till aftermarket arrives. Aftermarket tends to be higher quality anyway, doesn't it?

scotts2012ram · Jun 19, 2012

That's crazy high. I most have got luck mine has the factory lsd with the 355s

garner · Jun 19, 2012

Try to find a wrecked truck and get the rearend from that. Even a 2009-2010 rear end will bolt right up

BlueRamMan · Jun 19, 2012

got 3.92s and LSD with mine!

jlb · Jun 20, 2012

Me too, and I love it, minus the fact that it is still geared too high for me to turn both tires on dry pavement... lol, oh well, guess that means I better do some upgrades.

SuperBeaner · Jun 21, 2012

From everything ive seen 3.92 sounds like a decent compromise between performance and mileage...for now

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Best LSD for my 2012 2WD?

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