Rear differential fluid
 

What kind of rear diff. fluid should i be running in my 04 2500, and should i run the same in the fron diff? Also what kind of tranny fluid should i run, its a manual 6spd, and how often should i change that?

Front: 75W-90 tad under 3 qts
Rear: 75W-140 tad under 4 qts
Transmission: ATF+4 6 qts

Service every 40,000. Less if you do a lot of towing

NV 5600 doesn't take ATF...

https://www.dieselbombers.com/5-9-li...intenance.html

Ram NV5600 specs

Also your AAM 11.5 (rear axle) comes with 75w-90 from the factory but a 75w140 will work too.

Thanks for all your help guys, also i noticed my rear diff. fluid is a milky brown color, what the hell does that mean?:argh:

How many miles? It's likely from water contamination.

Make sure to get limited split additive if it doesn't already have it!

Aam's don't require a ls additive like the fords do.

Calls for 75/90 in both, but some run thicker in the rear. 75/100 is a good middle of the road but I don't know who else makes it but amsoil.
This also has ls additive in it so no extra needed. Good for 100k or for 50k for most of us(towing).
Highly recommend synthetic, brand is up to you.

i think i might have around 20-30k since i last changed it.

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so you recommend 75/140?

I would have to disagree with you on that, I tried that just to see if I could save a few bucks and it started chirping when making hard corners. As soon as I added limited slip oil it went away. But that is only if you have a limited slip rear end though too.