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For GMC TERRAIN 2010 - 2017 All Models. I would say it will be a wise decision if you grease your new ball joints. At least I will always grease a new one after the installation. I suggest you do so after the first installation.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.