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Originally Posted by xelasnave
... could we not have gravity change per location then please..the pioneer suggests that the gravity expected is "different" and the need for "dark matter" would appear to suggest a similar posibility.
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No, not to the extent that what you have proposed it does. That would entail a gross changes in the value of the gravitational constant, the strength of gravity c.f. to the other forces and would mean the abandonment of the inverse square law on a macroscopic scale. That would mean chaos.
What the presence of dark matter suggests is that there's a factor which is creating the impression that there's more mass present unseen than seen. It could have an effect on the Pioneer probes, but only if there were some concentration of dark matter close by.