Question about 2002 Ford Expedition

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I dont know if it is torque convertor but i have a vibration in the drive train. what do you think?

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  • Christopher Foulkes May 11, 2010

    At what speed is it occurring? If you ruled out a tire problem such as an out of balance or out of round tire i would start by checking both u-joints in the front and rear driveshaft.



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Why it my lye in the torque converter I would not expect this, I'd start else where first. My first call would be a universal joint at the drive shaft.
You'll need to climb underneath (engine off and E-brake on and inspect this) look for looseness with in the driveshaft. This could be withinin a tire too, perhaps a bulge in a rear tire or thrown weight giving you issues
I hope this may have helped,

Posted on Oct 04, 2009


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I have a 2001 gallant es and when am in drive and am stopped at a red light it states to vibrate but when am driving it stops, When I drop it in neutral it stops I've done a tune but it didn't fix it

might be your engine idle is low and is slowed even more by the torque convertor when stationary. In neutra there is no drag on the torque convertor and idle is allowed to stay faster hence no vibration

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Your flexplate and/or torque convertor are out of balance.
If recently replaced it should be a warranty issue.
By your testing you have determined it's transmission related.
I have seen new/rebuilt torque convertors be balanced incorrectly.

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The transmission in your car is the 4R70W model,and i've rebuilt hundreds of them through the decades,and the vibration you are likely feeling is in the torque convertor.I call it the "washboard effect",or at least that's what it feels like,running over an old timey washboard,and it can also be described as a shuddering sensation,or chattering.Inside the torque convertor is a clutch that engages to eliminate fluid slippage within the convertor,thus making it more efficient,resulting in better fuel mileage.This clutch becomes weak and slips,and that is what is felt.In most cases,the vibration is felt at speeds of 40 mph and higher.Ford and Lincoln dealers have a Technical Service Bulletin (TSB) out about this,and they advise changing the fluid by dropping the pan,and pulling the drain plug in the torque convertor,changing the fluid to a Ford specification fluid,and adding a highly friction modified supplement to the fluid to prevent the washboarding.In most cases,it solves the problem,but in some cases the torque convertor must be replaced.Good luck

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2 Answers

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