you can grease them when you install them but be careful about it, what i did is put a small amount of grease in them before install to get a good coating, but if you do too much it can get hard to install them because they slip out of your hand when you try to fit them over the swaybars

if you can, try to have someone nearby to help you install them, the fronts can be a little tricky because they are close to the factory skid plate under the front cladding