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Zapper2003 posted a topic in All Wheel Drive (AWD)Has anyone successfully cleaned out a gunked up PTU? The girlfriends 2008 Edge Limited AWD has 122k miles on it, and last oil change (120k) I topped off the PTU, and it seems like the internals are gunked up with jellied, baked fluid. I know this usually leads to failure, but before it goes that far and gets expensive, I'd like to get it cleaned out. I know a lot of people say to keep exchanging fluids until they clean up, but I'm going to be there a lonnnng time before that ever happens. I used a sucker-gun and got about 1/3 of the total capacity out today and exchanged with fresh fluid, but I know that's a feeble attempt. I have the factory service manual, and I know it says nothing internally is servicable, but that's not my concern. I just want to take it out, install a drain plug, split the case and clean the internals, seal it back up and reinstall with new seals. I've done quite a bit of googling, I see lots of pictures of cooked PTU's taken apart showing how gunked the internals are, but never found any threads leading me to my answer. Also, would popping the cap off the vent and running a hose up into the engine bay solve some of the 'puking' issues? My fear is that it's already on its way out, as the car has started in on a random 'thud' (very seldom, at this point) while turning a corner at any speed, randomly, for no apparent reason. Seems like it's coming from the PTU/driveshaft area. I took a look at the roll restrictor mounted below the PTU and it looks weird, but I've never seen another one to compare. Best I can tell from looking at pictures online is that it looks goofy even when new, so I doubt that the mount could be causing the sound, as I would think it'd be more often than during a random turn at speed. Any insight would be awesome and greatly appreciated.