differential additive

[HBarlow]

My whole point is that you are trying to pick up on a slight detail, that doesn't even matter in the realm of things. And I'm trying to figure out why you are even chasing it...

You stated "the AAM axle used in 2003 and newer Rams does not require an additive. The friction modifier additive was required in Gen II Dana axles. " If the AAM11. 5 LSD supposedly doesn't need LSD modifier; why would the choice of oil, regardless of it being LSD or non-LSD, have any impact?? So why would you even care if it contains LSD modifier or if it is LSD compliant? What impact does it have to the OP? What does it matter?

I have first hand experience with LSD chatter in my own truck, and have fixed the problem with a bottle of LSD additive. Period. I didn't get that from the manual.

Have a nice day.

Supposedly?

Have you ever read your owner's manual?


Dodge owner's manuals beginning with '03s clearly state no friction modifier is required.

 

[steved]

Wow, you got me there... sorry I don't go around quoting the manual, a document that was written by the lowest bidder, complete with typos.



My point stands... if they don't need it, why do some chatter without it? And by the responses in this thread alone, I'm not the only one that's experienced chatter in the 11. 5AAM.

 

[R.Taylor]

did you buy synthetic oil? Not sure if it matters, but the factory fill is synthetic.

The 140 is what I run, but I live in East Texas... ... it gets HOT here. !!

Is the factory fill synth?? Dealership replaced an axle seal on my rig last Aug under warranty..... I told them if they had to drain the pumpkin to save the oil and put it back in when they were done. I have the MagHytec cover... And had if filled with about $120 worth of Lubrication Engineers Synolec 9920 with 10k on it. I got the truck back and checked the dipstick... . My green colored 9920 was gone and it had amber colored non-synth oil in it. I know it was as it smelled like dino oil does. Is my dealership trying to save a buck or two??

 

[steved]

I know it was as it smelled like dino oil does.

Both my RP and Schaeffers smell just like conventional gear oil... probably not a good way to identify between the two.

 

[rbattelle]

Is the factory fill synth??

I believe it is. I could be wrong, but the specification calls for a synthetic, and I believe that's what they put in at the factory.



-Ryan

 

[mwilson]

I just run this oil in the 2nd and 3rd gen trucks that I own. Front and rear.

Good for most limited slips right out of the jug.



Mobil 1 Synthetic Gear Lube LS 75W-90



The limited slip has never worked in the 3rd gen, but if it ever does start my gear oil is ready!!!!Oo.



Mike.

 

[Cosmo]

Do you have a source that suggests that "nearly all synthetic lubes contain friction modifiers"? I don't believe that is correct.

Valvoline Synpower does
Valvoline.com > Products > SynPower > Gear Oil SynPower > SynPower® Full Synthetic Gear Oil

Mobil 1 does
Mobil 1 Synthetic Gear Lube LS 75W-140

Castrol Syntec does
Castrol USA - SYNTEC Gear Oil

Redline does - except the 75w90NS
Red Line Synthetic Oil - Gear Oil for Differentials - 75W90 GL-5 Gear Oil

Royal Purple does
Royal Purple Gear Oil

Amsoil Severe Gear works with most limited slips, but they sell an additional additive if you still have some chatter. Same with their others.
AMSOIL - Severe Gear® Synthetic Extreme Pressure (EP) Gear Lube 75W-90 (SVG)



Those are the vast majority of the big players, if you've got specific oils you would like me to search for, just let me know.

Is the factory fill synth??

It definitely is.


If you look it up in Alldata, this is what it says:


Front and Rear Axles
Synthetic GL-5 SAE 75W-90. 2500/3500 axles do not require limited slip additive.



Your dealership should put synthetic in, check your invoice - it should be billed out on there.