2021 2500 Desperately Needs Limited Slip

[MESchroder]

I bought my 2021 2500 Laramie Megacab w/Cummins in June of 2021. I wanted a 3500, but there were none on the lot. Apparently one of the managers ordered this truck and then decided he would put it on the lot. It was missing a few features that I have since added: Spray-in Bedliner, Puck System & In-the-bed trailer light hookup. What I didn't realize was missing is a limited slip differential. I found this out in an inch of mud and had to put in 4x4 every time I pulled in the driveway. My 2018 Tradesman had one and it functioned perfectly. I went to the dealer I bought it from and asked about an upgrade and they told me it had a Brake Limited Differential (BLD) and the computer couldn't be programmed for a limited slip. I have since found that it does not have the BLD and want to upgrade.

What are my options to upgrade to a limited slip?

Thanks,
Mark

 

[DILLIGAF]

TrueTrac

 

[Daw14]

^^^^^^^^^ This ^^^^^^^^^^

You will not be disappointed with this one, great stuff.

 

[stevenP]

I had a similiar thing couple years ago. I was looking for a new truck, found a RAM 2500 that was loaded with all kinds of other stuff, but no LSD, no trailering package, no spray in liner. Of course the manager of the dealership assured me that they could install all of those options right there for me. I laughed and said thanks, but no thanks. I am sure the liner was an easy install, but was skeptical on the puck system, and LSD.

 

[2003F350]

I had a similiar thing couple years ago. I was looking for a new truck, found a RAM 2500 that was loaded with all kinds of other stuff, but no LSD, no trailering package, no spray in liner. Of course the manager of the dealership assured me that they could install all of those options right there for me. I laughed and said thanks, but no thanks. I am sure the liner was an easy install, but was skeptical on the puck system, and LSD.

They likely would have sent the truck to LineX or a similar brand to have it installed. Every dealer I've had try to tell me they could have one installed, that's what they've ended up doing.

LSD's need to be installed by professionals, and I would hesitate to have it done by a dealer - very few have GOOD axle guys.

And for the puck system...well I'll share that my FIL's truck didn't come with the puck system, and he inquired about having it done. Short answer was yes, long answer was the service manager said he didn't have anyone he would trust to install it properly, and the cost was going to be more than double the cost than if the truck had been ordered with it - a B&W Turnover system would have been cheaper. There are, I believe, several people on here who have done it themselves, so it CAN be done, but if you don't have a good eye for detail and the skills to cut clean holes, it's better to leave it to professionals. He ended up getting a standard fifth wheel setup because by the time he pulled the trigger he needed it right away, and those rails do work well as tie-down points in the middle of the bed.

 

[lpennock]

Just installing a LSD isn't hard in the AAM axle. It isn't like doing a full gear set where it needs a good gear guy. The way the AAM is designed it is a very easy install since it uses adjustment collars rather than shims. You set the Ring gear to Zero lash and then add four or six flats (new vs used bearing) of preload to the pinion side and it is done. Takes longer to install the axles than the carrier.

 

[TC Retired]

Love, Love Love my 1500's combination with the factory limited slip rear end. We live up hill on a blind 90 degree right turn. We also get at least 1 snowfall a year of 20 + inches. I can come in throwing snow back to heaven and don't even really slip. Just jack the Truck up to 5 on the air rides and let it throw snow.

 

[Joseph Godvin]

In 1976 I worked at Metro Chrysler Dodge as a Mechanic. Axles were one of my specialties, I had them get me all the special tools, especially for the Dana axles in the Ramcharger/ Trailduster front axle. rebuilt many over the years, the LSD unit is simple to install.

 

[MESchroder]

Thank you so much for the info to date.

So I checked with Eaton and they said that I needed to know the size of the existing rear. RAM put 2 rears in the 2500s, 10.5" and 11.5". Both are 14 bolt pumpkins. Eaton does not have an option for the 10.5". I then checked with the local shop, that was recommended by friends, and they said the only option was the OEM Mopar LSD. Can anyone tell me how to identify the size of the rear without cracking open the Diff?

Thank you again.

 

[nlambert182]

If you have a 6.7, you have the 11.5 rear. The 10.5s were only in the gassers.

 

[crazy jerry]

they quit using 10.5 in 2013

 

[Grams]

Thank you so much for the info to date.

So I checked with Eaton and they said that I needed to know the size of the existing rear. RAM put 2 rears in the 2500s, 10.5" and 11.5". Both are 14 bolt pumpkins. Eaton does not have an option for the 10.5". I then checked with the local shop, that was recommended by friends, and they said the only option was the OEM Mopar LSD. Can anyone tell me how to identify the size of the rear without cracking open the Diff?

Thank you again.

Use this link to enter your VIN and you will Instantly get the “Build Sheet” for your RAM. It should specify which axles and other equipt. Chances are (as posted by nlambert) that you have the 11.5” rear diff.

FCA RAM

fcagroup.my.site.com

I’ve got a similar concern…. I just bought a ‘24 Ram 2500 w/6.7 Cummins…. and am puzzled over why a 4WD truck would have “Conventional differntials” I can’t imagine what they were thinking to have 4WD with non-limited-slip axles.

 

[nlambert182]

If you have a Cummins... you absolutely have a 11.5 diff. They didn't put a 10.5" behind any year 6.7 Cummins.

 

[MESchroder]

Thanks Y'all

 

[mtnrider]

I'll be honest, a limited slip will help a little bit but it's not likely going to prevent you from going into 4x4 in the situations you described. This is a big heavy a$ truck and even a little mud can slow it down. As long as you are getting moving in 4x4 I'd call it a day, I wouldn't invest money in the diff and install I don't think the gain is there.

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