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Old 03-27-2013, 01:02 PM   #11
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Quote:
Originally Posted by RamblerGuy View Post
Our 2011 Sunseeker 3100 (2010 Ford E-450 chassis) sometimes clanks when I shift it into park. It's the driveshaft, which is quite long and has several intermediate supports. When in drive or reverse, the driveshaft is tight against any slack. When you engage park, it sort of recoils to its unloaded position. As long as you are fully stopped when you shift into park, don't worry about it. If you are still rolling and it clanks, let it be a reminder to don't do that! You could probably prevent it by shutting the engine off with it still in drive or reverse, then putting it into park. That way there would be no tension on the driveshaft when you shift it.
Correction: There may be a little tension on the driveshaft even in neutral. The clutches in an automatic transmission are running in trans fluid so there's some hydrodynamic friction that will transfer the rotation of the parts. It's not enough to move the car but it will turn the driveshaft if the wheels are off the ground. We have to shut the engine off on our Pathfinder to shift from 4wd high to 4wd low because of this. Engaging the driveshaft disconnect after towing it is likewise tricky. And sometimes embarrassingly loud.
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Old 03-28-2013, 10:43 PM   #12
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Normal... Mine has done it since new. Classic Ford cut-away chassis sound having driven rental box vans.
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Old 03-28-2013, 11:27 PM   #13
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Don't know about Fords, but Chevy's will do it if the slip joints on the driveshaft get dry. A little bit of spray lithium grease on the splines stops it.
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Old 03-29-2013, 04:28 PM   #14
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Glad this got posted as I've wondered about it too. Sounds like I'm not alone. I asked the Ford dealer when I was in for an oil change and he said it was normal. He mentioned something about the vehicle being longer as the reason but I really didn't understand so might have missed what he meant to say.
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