What type of Amsoil oils should I use?

[JPM]

there are a lot of different oils listed for all the components on my truck, whats the best ones to use? How do I tell what diffs and transfer cases I have?

hhttp://www.amsoil.com/mygarage/VehicleLookupPage.aspx?FromIndex=1&url2=2003+DODGE TRUCKS+RAM 3500 PICKUP+C

 

[shorthorn]

JPM,

I use Amsoil Severe Gear 75W-90 in my 05 2500 cummins.

Your rear diff would be the 11.5"... All Cummin's trucks have that rear diff.
Front Diff is the 9.25"

Transfer case should be the NV243

I don't run Amsoil in the transfer case / transmission.. I use the Supertec ATF+4 in both of those components.

 

[Tuesdak]

Add an extra quart and overfill: Manual Transmission,NV5600 (6-SPD)......GLS [3]
All TEMPS......
Synthetic Synchromesh Transmission Fluid (5W-30) (MTFQT)

Engine can run about anything with my preference for the pre 2007 oil.

SAE 15W-40 Heavy-Duty Diesel and Marine Motor Oil


Note: Power steering is ATF+4 NOT power steering fluid. If the stuff in the pump isn't pink/red it's the wrong stuff.

 

[AH64ID]

Engine: AME 15w-40 Heavy Duty & Marine Oil
Trans: MTF Syncromesh
xcase: ATF
Diffs: SVG 75w-90



The transfer case is a NV271 if a manual shift and NV273 if electronic.
In 2003 there where 2 difference rear axles used, but since you have a NV5600 you have the AAM 11.5" axle.

 

[JPM]

here's what I ordered
transmission + one extra quart

axles

transfer case