Kodiak/Big Bear/Bruin/Wolverine Discussion diff vent tube throwing oil April 8, 2015 the vent tube from the rear diff. is throwing oil all over the front. took screw out and what seemed to look like motor oil came pouring out! what would cause this? 99-00 400 big bear 2wd Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related