Thanks for the reply Swartik,
I think I will go with the Moog Rubber Bushings.
I am not a mechanical engineer, I have read that
the Polyurethane although they are a lot tougher in
longevity will actually put more stress on the metals
that they are inter connected to. This being an older
truck with a lot of older metal seems like the rubber
bushings would be the way to go.
Thanks Mark K