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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.
Ck your owner manual under service maint. I follow what the owner manual shows. If you end up just doing a lube oil and filter, I would also do a tire rotation and change at least the rear diff. If you have pos track on the rear, be sure the inspection cover is removed and reseal. Thats because the clips inside the rear diff fall into the oil and grind up into the pinion and bearing, the clips hold the pos clutches so they don't chadder. Also fricton modifer too.