4.5G aftermarket front locker or LSD status?

[patricio2626]

Has anyone heard anything about a locker or LSD for front axle yet for '19-'20 HD's?

 

[regal2800]

ARB makes one for the front. Still waiting on them to make something for the AAM 12 rear axle.

 

[patricio2626]

ARB makes one for the front. Still waiting on them to make something for the AAM 12 rear axle.

This is news to me. Are you able to give me an exact part number?

 

[regal2800]

ARB RD 197 is the locker for the front axle. It's an AAM 9.25. They dont make a rear locker for the AAM 12 found in the HO 3500s.

 

[patricio2626]

ARB RD 197 is the locker for the front axle. It's an AAM 9.25. They dont make a rear locker for the AAM 12 found in the HO 3500s.

I called ARB tech support and they told me that ARB RD 197 does not fit newer models.

 

[regal2800]

I called ARB tech support and they told me that ARB RD 197 does not fit newer models.

He doesn't know what he's talking about. the aam 9.25 hasnt changed. i have the RD 197 installed on my '19. works great.

 

[Ram01]

Do all 2021 3500s have the AAM 12, or is it only certain 3500s?

 

[Epsilon Plus]

Do all 2021 3500s have the AAM 12, or is it only certain 3500s?

Not all. Just High Output Cummins.

 

[Ram01]

Which ones would those be, any diesel 3500?

 

[Brewbud]

Which ones would those be, any diesel 3500?

If you have the 3500 HO you will have the Aisin trans. If you have the SO you will have the 68RFE

 

[Ram01]

So any 3500s, even if a dually, if it's not HO it'll have the AAM 11.5? If so, does the AAM 11.5 ARB air locker work, the ARB RD 139? I'm wondering because an ARB dealer in my area said it's only for models 2018 and older, that newer models are not compatible with the ARB RD 139 (rear) or the ARB RD 197 (front).

 

[2manyprojects]

For what it's worth, the latest Dodge/RAM application guide from ARB lists both front AAM 9.25 and rear AAM 11.5 axles as "2003 on", fitting the RD 197 and RD 139 lockers. There's footnotes indicating the front RD 197 for 2007-on requires a ring gear spacer and longer bolts, while the rear RD 139 won't fit some 2016-on dually's that used a 16 bolt ring gear.

 

[Ram01]

Right. Does anyone know which use the 16bolt ring gear?

 

[regal2800]

Right. Does anyone know which use the 16bolt ring gear?

The 16 bolt is the AAM 11.8 on the previous gen dually.

 

[Lary0071]

Does the Eaton Trutrac TT914A643 work in the 2019+ 2500 Hemi front axle?

Based on this description, it looks as if it would?

https://www.justdifferentials.com/Dodge-9-25-AAM-Truetrac-p/tt914a643.htm

 

[Big Brown]

FYI, The 2019 and up 3500 with HO, does has a set of different AXLES, AAM 10.5'' FRONT & AAM 12'' REAR.

 

[regal2800]

FYI, The 2019 and up 3500 with HO, does has a set of different AXLES, AAM 10.5'' FRONT & AAM 12'' REAR.

The front is still an AAM 9.25 on the 3500 HO. Only the rear has the bigger aam12.

 

[Zuber]

I got the same word from ARB, 2019-newer has a different front axle or spline count from the 2018-older and the Power Wagon (33 count). Haven't found a Mfgr that claims to have a locker to fit.