Yes I did grease them. And cleaned the shit out of the metal holes where they go. The squeaking comes and goes. I have had this with Poly bushings on other vehicles too. Kinda sounds like a Beaners Gardning truck
I've run the poly bushings for years and only got squeaking after 15 years. I now use teflon trailer ball grease; it makes the bushings slide nice and won't attack the bushings like axle grease can. That will cause the bushings to squeak on and off.
Pennyman1 Living the D-50 life since 1980 The best Dodge that Dodge never made