I seriously doubt it is piston slap, especially at just 60k. Modern engines are good for over 200k, even a Chrysler. It sounds like you have a little bit of lifter noise from the oil draining and they are not pumping up all the way until they get a solid stream of oil. I would definitely switch from conventional to synthetic oil and add some Zmax into the crankcase. It really does work. Other than that, if you sell now, you are wasting about 3/4 of the trucks useable life and spending money you don't need to.
I won't argue that it might not be lifter noise because it could be, but I will say that lifter problems are associated with mileage more than piston slap. While a high mileage engine might develop piston slap, it is mostly associated with the design of the hypeutectic piston designs in modern engines. Pretty much all modern engines are designed with much lighter rotating assemblies which allows them to be more efficient. One of the ways they lighten a piston is with the material and by making it shorter and moving the wrist pin and ring pack closer to the top.