12" AAM rear diff 'anti spin' - Page 2 - Dodge Cummins Diesel Forum
4th Gen Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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post #13 of 89 (permalink) Old 05-10-2019, 10:17 AM
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Quote:
Originally Posted by NIsaacs View Post
The new 12" in the '19's are clutch type now. They also have 4.250" axle tubes, larger hubs and a different wheel bolt pattern.
I'm not seeing a different wheel bolt pattern. I'm not saying you're wrong, but I didn't see it. That would be stupid to have a two bolt pattern options.


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post #14 of 89 (permalink) Old 05-10-2019, 10:54 AM
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Originally Posted by Satan's Chariot View Post
I'm not seeing a different wheel bolt pattern. I'm not saying you're wrong, but I didn't see it. That would be stupid to have a two bolt pattern options.
I think it is just the dually.

The Max Tow package returns and brings with it larger rear rotors, a 12-inch ring gear, bigger bearings and shafts, the latter requiring a larger bolt circle, so whether or not you get Max Tow every dually will have a different bolt pattern than SRW trucks. With Cummins power, only the MegaCab 4x4 2500 has a tow rating of less than eight tons.

https://www.turbodieselregister.com/...ram-hd.265793/

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post #15 of 89 (permalink) Old 05-10-2019, 01:35 PM Thread Starter
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My single rear wheel came with the 12Ē pig according to the sticker. I also measured the discs when they were putting on my MT MTZ. The rear discs we almost 15Ē and the front discs were around 14Ē. Which makes me think I got the max tow package? The standard brakes are supposed to have smaller discs in the rear.
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post #16 of 89 (permalink) Old 05-11-2019, 10:15 PM Thread Starter
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Quote:
Originally Posted by lpennock View Post
It is a torsen style LSD. Has a 2:1 torque bias ratio. No friction modifier is required and works better if none added (some have had noise issues requiring friction modifier).

Btw: It's actually a 12.5"

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Is there any way I can verify this. Iím not doubting you. But Iím getting mixed info from Ram. I talked to someone at MOPAR and even they didnít know if it was Torsen or clutch. A senior MOPAR Tech is supposed to get back to me. 3 dealers told me that it requires additive which would tell me itís clutches. I donít mean to obsess, but I find it odd that AAM doesnít even list a 12Ē yet. Iíve never had so much trouble getting basic info on a pig before
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post #17 of 89 (permalink) Old 05-12-2019, 12:44 AM
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Originally Posted by esminbritt View Post
Is there any way I can verify this. Iím not doubting you. But Iím getting mixed info from Ram. I talked to someone at MOPAR and even they didnít know if it was Torsen or clutch. A senior MOPAR Tech is supposed to get back to me. 3 dealers told me that it requires additive which would tell me itís clutches. I donít mean to obsess, but I find it odd that AAM doesnít even list a 12Ē yet. Iíve never had so much trouble getting basic info on a pig before
Easiest way to verify without any uncertainty is to pull the diff cover and look.
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post #18 of 89 (permalink) Old 05-12-2019, 09:51 AM Thread Starter
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I wouldnt mind doing that but I normally change diff fluid at 1k for break in. It seems like someone must know for sure what it is. It's a 12" rear diff. No company has ever used such a large diff in a light/medium truck before. The mystery of this seems unnecessary. Somebody knows this.

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post #19 of 89 (permalink) Old 05-13-2019, 08:15 AM
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Just to help keep the water muddy, this is from the ownerís manual for the Ď19 2500/3500 I have with my new truck.

We recommend you use SAE 75W-85 HD Ram GL-5
Synthetic Axle Lubricant in 9.25 Front & 11.5 Rear Axles. Use
Mopar Synthetic Gear Lubricant SAE 75W-140 (MS-8985) in
12.0 Rear axles. Limited slip additive is required for limited
slip axles.

The only way to know for sure is as already posted, pull the cover and look at it.

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post #20 of 89 (permalink) Old 05-13-2019, 08:48 AM
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my 2019 dually with the max tow package is 8x200mm wheel pattern
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post #21 of 89 (permalink) Old 05-13-2019, 09:15 AM Thread Starter
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Originally Posted by Don_T View Post
Just to help keep the water muddy, this is from the ownerís manual for the Ď19 2500/3500 I have with my new truck.

We recommend you use SAE 75W-85 HD Ram GL-5
Synthetic Axle Lubricant in 9.25 Front & 11.5 Rear Axles. Use
Mopar Synthetic Gear Lubricant SAE 75W-140 (MS-8985) in
12.0 Rear axles. Limited slip additive is required for limited
slip axles.

The only way to know for sure is as already posted, pull the cover and look at it.
Yeah. i read that too. Doesnt really help much. I gotta use the 75/140 but the rest is still vague.

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post #22 of 89 (permalink) Old 05-14-2019, 09:14 PM
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"Is it a torsen style clutch system?"

The TORSEN Limited Slip mechanism does not employ clutches. it is a series of helical gears arraigned to provide a lock up of both axles after one or the other side slips.

To further clear the air the AAM axles have never had a TORSEN unit in them! The unit in the AAM axles is an internal AAM design.

This comes directly from the VP of sales for TORSEN. This topic came up some time back and since I work for the parent company of TORSEN, I asked.
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post #23 of 89 (permalink) Old 05-14-2019, 09:30 PM Thread Starter
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"Is it a torsen style clutch system?"

The TORSEN Limited Slip mechanism does not employ clutches. it is a series of helical gears arraigned to provide a lock up of both axles after one or the other side slips.

To further clear the air the AAM axles have never had a TORSEN unit in them! The unit in the AAM axles is an internal AAM design.

This comes directly from the VP of sales for TORSEN. This topic came up some time back and since I work for the parent company of TORSEN, I asked.
I knew Torsen didnít use clutches. So the AAM differential in the AAM axle uses what design? Helical gear or Viscous? I opened the cover today and it does not have clutches. I think people refer to the AAM as a ďtorsen-style.Ē Iím guessing they mean helical geared style.
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post #24 of 89 (permalink) Old 05-14-2019, 09:47 PM
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The AAM TracRite LS is a helical gear design with not clutches but rather brake shoes to control the TQ bias. You really want to use the recommended fluid and not try to mess around using others, results may not be as expected.

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