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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
SYNTHETIC 75W-90 for anything larger than the 9.25" rear. 75W-140 for the 9.25" rearend. These are for rear axles only and comes out of the DC shop manual for 2003 Rams.
If you crawl under the back of the truck and look at the passenger side end of the rearend housing, there's a little tag there that should say. I also think it's on a tag in the glove box too.
I don't know about the transX's posi track addative.
I'd just get it from your local Dodge parts department.
You only need four ounces of the stuff, so it can't be that expensive, right?