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Discussion Starter · #1 ·
Some of you know I call Randy's R&P every couple months. Well i just got off the phone with them. They told me about a local shop which I despise, Eastern Offroad who has made it possible. They installed Yukon 4.56s for the non "ZF" Chrysler 9.25 rearend in a customer 2011 dodge ram last month. Randy's told me that they sent the carrier to a local machine shop and had it drilled out to work with the Yukons :rockon::rockon:

I just got off the phone with Eastern Offroad. They are going to call me back with more detailed information and pricing. 2011 guys stand by......
 

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To tell you the truth, there is no advantage to the ZF rear ends
except to Chrysler abiding with the fuel mileage goals set by the FEDs
the rear end housing is 40 pounds lighter
on some of the gears, i think the Ring gear is welded on to save the weight of the bolts
this allows Dodge to claim better MPGs, therefore they are meeting the goals

Personally i think 2009 - 2010 rear end is better & stronger, as well as easier to work on
 

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Discussion Starter · #4 ·
I'm going in Saturday for an install brief. Not really sure on the specs and what their going to do. Sounds like I'm a tester, but I should be the first '11 4x4 with 4.56. On the phone they said their going to install an modified oem lsd carrier with the new 4.56 R&P. I know thats not alot of info, but that's all I have for now. At least it's hope haha
 

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Keep us informed
sounds like fun
 

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Discussion Starter · #9 ·
Im pretty sure all 11s have the ZF rearend.

An aftermarket 2010 carrier cannot be used. An oem 2010 carrier whether open diff or lsd cannot be used. The only thing that will work is a 2011 carrirer. They have done an open diff on a 2wd. Yukon said the 2011 oem modified lsd should be fine, it will just need some more modification to work with the aftermarket gears. Im hoping its fine bc I'll be SOL and have to order an open diff and let them start all over.

As of right now it's going in the shop next Thursday :D
 

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Do you have any info as to what type of differential the ZF LSD is?
I've heard it's a torque sensing type similar to a Detroit True-Trac.

My '12 Express has 3.55 gears with LSD but when both rear wheels are lifted off
the ground and spin one tire the other tire spins in the opposite direction just like a open diff.
The diff definatley behaves like a LSD in that both wheels will spin in dry, wet or variable traction conditions.
 

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I am almost willing to bet, that you could take an '09/'10 complete rear axle assembly tires lug nuts & all, & switch it with an ZF '11/'12 rear axle assembly

It would just be 40 pounds heavier

BY the way, all those rear axles that were recalled, were ZF made
cheap bearing made in China
front lube port to low
casing design. has no cavity for the oil to get to the cheap bearing

quick fix, over fill the oil
2nd quick fix, put a fill/inspection port back in the rear differential cover, like they were forever
 

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Discussion Starter · #12 · (Edited)
Thats the only other option is to do a complete axle swap, but its 1500-3000 bucks depending on where you get the axle. This is costing 200 bucks...

Btw i know the issues with the axle, its not really a big deal. Feel free to quit talking shit about the assembly. Its pointless and you got your pointless point across in your first post. I dont really know where you're trying to go with those remarks, but I'd appreciate helpful replies like the first half of your third post not this childish crap :D

Also if anyone is interested in doing gears, I will see if they can jus modify a carrier for some that would like them. Maybe they will let me bring in an oem carrier and they can modify them to accept aftmarket gears and then mail them out. Then you could get gears of your choice installed as well....
 

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So as of now besides doing what your doing Candy...theirs no option of doing gears/LSD in the 2011's?

I have the 3.55's in mine and would like to upgrade when I go to 35s down the road am I just stuck with the 3.55s?
 

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So as of now besides doing what your doing Candy...theirs no option of doing gears/LSD in the 2011's?

I have the 3.55's in mine and would like to upgrade when I go to 35s down the road am I just stuck with the 3.55s?
Maybe I'm getting confused on some of this, but on your question of having no option to your 3:55's on your '11, my understanding is that you can use at least the 3:92 for the '11-'12 models in your '11 carrier.
 

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Maybe I'm getting confused on some of this, but on your question of having no option to your 3:55's on your '11, my understanding is that you can use at least the 3:92 for the '11-'12 models in your '11 carrier.
pretty sure hecan go up to oem 410.
 

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Discussion Starter · #16 ·
^ exactly. You can go up to 4.10s. You just have to use OEM gears and they are a pretty penny! Even if you're 4x4 you can do the oem 4.10s in the rear and throw aftermarket 4.10s up front.
 

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Thats what I thought just wasn't sure. Thanks for the answers though guys trying to get all my information straight before I make the step to a lift and gears
 

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Do anyone know what type of Limited Slip Differential is used in the ZF axle? Who makes it China, Eaton or is it ZF's own design?
 

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Discussion Starter · #19 ·
Imo but it's crap. Mine only seems to work half the time :(
 

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It recently snowed here so I've had a chance to try it out. So far
it has worked well even when one tire on snow or ice and the other
on dry pavement both tires spin.
 
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