Vibration Driving me crazy Help - Ford Powerstroke Diesel Forum
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Old 06-24-2013, 11:19 AM
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Vibration Driving me crazy Help

2000 ford excursion 2wd 263k I have rebuilt the whole front end all new bushings tie rod ends etc even new power stop rotors bearings and brakes. New rims and new tires (2nd replacment from discount cuz they thought maybe it was tires) I have thought maybe it was at high RPMs so I started in first gear and got up to 2800rpm with no vibration then 2nd same thing no vibrations went to 3rd with ODoff and no vibration at high RPM then it shifts to 4th and at 65 plus RPM is around 2k and climbing it starts to vibrate and does not go away. Any idea? Maybe ICP? Or regulator or injectors? I thought drive shaft but it does not vibrate at high RPM in the other gears.....
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Old 06-24-2013, 06:23 PM
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Maybe torque converter chattering going into lock up, when did you change fluid last etc?
Sound speed related not rpm so maybe driveshaft carrier bearing or rear diff bearing where yoke goes in?
Take a friend for a ride or let them drive and see if you can narrow down at least what part of vehicle it's coming from?
As you can tell I'm just shooting in the dark but hope this may help you find the issue. Good luck!
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Old 06-28-2013, 03:47 AM
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I am almost positive it's the rear end now... I changed the oil and it got worse...


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Old 06-30-2013, 01:09 AM
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Get your driveshaft rebalanced. Make sure they do it as a whole assembly. Possibly a u-joint may be going bad. The reason why I believe this is because in OD, even though the driveshaft is spinning less, your putting more engine load through it.

It very well could be in the rear end too. Pinion bearing? When you changed the diff oil, did you make sure to use 75/140 synthetic and add the bottle of friction modifier?

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Old 06-30-2013, 06:08 AM
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Yes I did change the gear oil but had to use 85-140 and friction modifier because that is all they had in stock...


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