Cummins goes to 1075 lb-ft

[NIsaacs]

Ram is close. Just optioned a 2021 Mega DRW HO Limited at $95.5K.



I don't know why it wouldn't fit.

As you can see in my above photos the housings are the same. Measured 4.25" axle tubes on a 2500 gas, 2500 Cummins, 3500 SO/HO. I can't see a single reason to have the axle housing the same externally but not internally. Just bolt in the required carrier etc and go on.

Apparently that's the case. I just can't see why Ram would install the 12" housing in all HD's, then de-rate some of them with a 11.5" ring gear. I would think it would be simpler to make them all the same. I wonder how they are with build/quality control, it would be my luck to get a Max tow with the 11.5", other than a number on paper, stuck to the housing, there would be no way of knowing what is inside.

 

[AH64ID]

Apparently that's the case. I just can't see why Ram would install the 12" housing in all HD's, then de-rate some of them with a 11.5" ring gear. I would think it would be simpler to make them all the same. I wonder how they are with build/quality control, it would be my luck to get a Max tow with the 11.5", other than a number on paper, stuck to the housing, there would be no way of knowing what is inside.

Well you could measure the ring gear at your first oil change

It's just like the 11.5 and 11.8. There was no way to know without pulling the cover if you got the correct R&P or not.

If you look at the SO GCWR's there isn't a need for the 12" R&P. It's surprising how much lower it is than the HO.

 

[NIsaacs]

If you look at the SO GCWR's there isn't a need for the 12" R&P. It's surprising how much lower it is than the HO.

Agreed, that's my point. Why the big 12" housing if it is not needed, especially the gasser. I guess they figure one housing and two carriers is simpler/cheaper than two complete assemblies.

 

[DavidC]

#ad

 

[gsbrockman]

Agreed, that's my point. Why the big 12" housing if it is not needed, especially the gasser. I guess they figure one housing and two carriers is simpler/cheaper that two complete assemblies.

Apparently the “innards” are more costly amongst the variations than the savings associated with having multiple housings. But......I’m just a dumb ol’ owner operator....

 

[TFucili]

Apparently the “innards” are more costly amongst the variations than the savings associated with having multiple housings. But......I’m just a dumb ol’ owner operator....

White Lighting has a Dana, right? The '19+ have also gone to AAM, it seems.

https://www.forgingmagazine.com/for...line-systems-for-ram-trucks-american-axle-mfg

 

[gsbrockman]

White Lighting has a Dana, right? The '19+ have also gone to AAM, it seems.

https://www.forgingmagazine.com/for...line-systems-for-ram-trucks-american-axle-mfg

That’s my understanding. The front is referenced as a 275 FBI and the rear is a 310 RBI, although I’ve been told that the front might be a Magna Steyr?

 

[Tuesdak]

Stop by your local Ram dealer and stick your head under there with a tape of your own. You'll find the same thing I did, 4.25" housing on everything. Guts may vary.

It's not that @NIsaacs isn't up for the challenge, but, there are not many 3500 RAM trucks on the dealer lots at the moment in AZ. Further he might get run over as the ones coming in are selling fast. Like only 3 days on the lot.

The best selection of 2020 HD RAM trucks is actually in your state aka YOUR backyard at the moment. Aka Peterson's ...

 

[NIsaacs]

although I’ve been told that the front might be a Magna Steyr?

That's what is in your truck. Like Tom said, Ram has moved to AAM for the 4500/5500.

Copy and paste from 2019 Cab Chassis info release.

"Ram Chassis Cabs get a 12 inch AAM rear axle while 4×4 models get a 12 inch AAM rear axle and a 10.5 inch AAM front beam axle with a center disconnect. A multitude of gear ratios are available ranging from a 4.10 all the way up to a 4.89 ratio depending on Engine/Transmission and model configuration."

2019 Ram 5500 Chassis Cab rear axle....Looks a lot like the big Dana.

 

[Wiredawg]

Interesting the different nomenclatures they have for the same component... the rear axle on mine has a tag that lists it as a Dana S110, but my FSM lists it as 310 RBI. Actually, the FSM doesn't ref Dana at all. The FSM on my 09 4500 referenced the axles with Dana names. Interesting.

Cheers, Ron

 

[JPM]

I'm a graph kind of guy, or maybe I'm just a simpler guy...

Gas 2500 - 11.5"
Gas 3500 SRW - 11.5"
Gas 3500 DRW - 11.5"

Diesel SO 2500 - 11.5"
Diesel SO 3500 SRW - 11.5"
Diesel HO 3500 SRW - 12.0"
Diesel SO 3500 DRW - 11.5"
Diesel HO 3500 DRW - 12.0"

Did I get this right?

are those figures the same through the last few years?

 

[AH64ID]

are those figures the same through the last few years?

19+. The 12" wasn't available before then.

 

[Ben_Stadelman]

More numbers for our entertainment:
https://www.ramtrucks.com/ram-commercial/body-builders-guide.html
https://www.ramtrucks.com/BodyBuild...jGgHzAHGUTU0WB3rWuqSY7YmQ2vEhuBWBBrRM5qfWYz9

 

[gsbrockman]

Interesting the different nomenclatures they have for the same component... the rear axle on mine has a tag that lists it as a Dana S110, but my FSM lists it as 310 RBI. Actually, the FSM doesn't ref Dana at all. The FSM on my 09 4500 referenced the axles with Dana names. Interesting.

Cheers, Ron

And......I’m presuming the nomenclature for the front is in millimeters (275 or about 10.826”) and the rear (310 or about 12.204”).

 

[TFucili]

That's it, I'm trading up to a 4500 for 1/4" bigger ring gear.

 

[dieselshadow]

That's it, I'm trading up to a 4500 for 1/4" bigger ring gear.

Gonna join the under-powered and over-sprung camp are ya?

I think buying new badges would be much easier and quicker. That 12” ring gear would magically be equipped as well.

 

[Wiredawg]

That's it, I'm trading up to a 4500 for 1/4" bigger ring gear.

And getting Gi-Normous brakes

Rear axle rated same as WHOLE 3500 pickup 14KLbs, pretty good for just a 1/4", huh?

Greg, I'm afraid I'll take your word for dimensions, getting enough underneath work on my RV brakes

Christmas Cheers, Ron

 

[crazy jerry]

aam casts their name into the pumpkin. no way you could mistake it for dana

 

[Wiredawg]

And Dana attaches a metal plate, no way to mistake it for an AAM.

And sorry, it's a Dana S111, not S110.

Christmas Cheers, Ron

 

[TFucili]

And Dana attaches a metal plate, no way to mistake it for an AAM.

View attachment 125626

And sorry, it's a Dana S111, not S110.

Christmas Cheers, Ron

Gets bigger with every post! I mean... errr... never mind.