They keep the dirt out and the lube in. If dirt gets in it will cause the TRE the fail prematurly.


/1996 Trooper SE\
OME 912's w/2.5" spacers, Superwinch hubs, 265/75R16 Yokohama Geolanders (street), 34x10.50x15 Super Swamper LTB's, Indy4x HD Tie Rods, Indy4x Rock Sliders