Uncategorized Grease in Rear Diff? April 28, 2016 dstech Anybody running grease in their 420 rear diff? I recently read a thread on Highlifter forums from about 4 yrs ago where guys were running grease to keep water out the rear diff. They had inserted a grease zert to be able to add grease. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related