I rotated my tires the other weekend and noticed grease fittings on the tie rod ends. I was under the impression that GM had sealed ball joints on the NNBS trucks. My old 1998 Chevy truck was full of them (11 fittings IIRC). I never greased my old 2008 Silverado, I guess I FAIL. My question is how many grease fittings are on the 2WD Silverado NNBS 1500 trucks? Thanks.