When (and if) you pull a rod cap, be sure to push the piston down some and look at that half of the bearing also. All the Magnums I have checked have had upper rod bearing wear. Not like about to make noise wear, just the outer, thin grey coating was gone some and you could see the copper color coming through. Even the 35k mile one in my Scamp had very early stages of this. It wasn't showing copper color or anything, but you could see that the process had started. I threw new rod bearings in it since I was there.
I looked into what causes upper rod bearing wear and come to find out it's from high engine load at low RPMs. Sounds exactly like what a motor in a truck would experience, if it was worked. Now maybe a magnum from a Durango wouldn't see the same use as one from a Ram, so maybe it wouldn't have the same wear. All my magnums came from trucks.
