Dumb question on 2020 RAM 12" axle

[Bug Out]

My build sheet does not say anything about it having LSD etc in rear axle. I have 4:10's. Looking briefly at the owners Manuel it says add LSD fluid?

Also, rear axle running at 175 empty. Normal ? 1500 miles on it, little towing yet.


TIA

 

[TFucili]

The 12" is a clutch-type diff, so either additive, or LSD compatible fluid. No idea on the temps, but I can say mine was not nasty looking when I changed it at 20K.

 

[Cummins12V98]

Running light duty 75-90 and heavy towing 75-110. I highly recommend AMZ/OIL SevereGear, get rid of the OE JUNK at around 5k. The squeeze bottles are great!

 

[Cummins12V98]

The 12" is a clutch-type diff, so either additive, or LSD compatible fluid. No idea on the temps, but I can say mine was not nasty looking when I changed it at 20K.

Were you towing heavy?

 

[TFucili]

Were you towing heavy?

Probably a bit under 3K miles pulling the toy hauler, and most of that was with it dry/empty to and from Oklahoma for warranty work. It's only about 12K empty, but puts over 4K on the hitch.

 

[TFucili]

Running light duty 75-90 and heavy towing 75-110. I highly recommend AMZ/OIL SevereGear, get rid of the OE JUNK at around 5k. The squeeze bottles are great!View attachment 123646

The 12" axle calls for 75W140. The front is still 75W90.

 

[Bug Out]

Thanks. I'm going to start ordering the first oil change supplies here shortly. 75w140 with LSD additive. Amsoil by the way. The last RAM 2016 3.42's rear axle never got over 150 degrees ( after AAM alum cover installed) even towing 18K up hills.

 

[Cummins12V98]

Thanks. I'm going to start ordering the first oil change supplies here shortly. 75w140 with LSD additive. Amsoil by the way. The last RAM 2016 3.42's rear axle never got over 150 degrees ( after AAM alum cover installed) even towing 18K up hills.

I advise you call AMZ/OIL as I doubt the modifier is needed.

 

[Cummins12V98]

The 12" axle calls for 75W140. The front is still 75W90.

OK, looks like things have changed!

 

[Blackbrush]

Redline Heavy Shock Proof has been amazing for me. Almost 1,000,000 miles across 3 trucks with zero issues and zero chatter

 

[DeansRedRam]

How are you monitoring rear diff temps? Pull over and shoot it with a temp gun?

Also, why would they go to clutch type on a 12" rear? As far as I know I have a 11.5" that is gear activated torsen rear end.