I'm finally in the process of getting my truck back together, but I cant remember if there was a bushing of any sort between the frame and rad support. I dont see anything on my parts shelf... but I feel like there should be something there?
According to the service manual there should be a large bolt with a large washer. Next is a rubber pad this pad will be inside of the core or radiator support under the large washer. Next under the frame or the raised sections that the support sits on is a nut. This nut is a large square with a metal insert surrounded by rubber with a raised round center around the metal inside threads. This is followed by a large washer and another nut. This is if you have a conventional cab. If you have an integral cab add a small spring on the inside of the core support and take away the square rubber pad. The spacing on the bolt and spring heigth should be 1.28 measured from bottom of the bolt head to floor of the core support.