Vibration 65mph and higher! - Ford Powerstroke Diesel Forum

 
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post #1 of 8 Old 06-22-2013, 05:09 PM Thread Starter
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Vibration 65mph and higher!

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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post #2 of 8 Old 06-24-2013, 04:38 PM
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Check my post in this thread: Center Support Bearing and U-Joints, which ones???

Could be your driveshaft or u-joints.

Also engine RPM does not translate into driveshaft RPM so putting it in 1st gear and driving at 4000 engine RPM would yield an estimated 9k RPM of driveshaft speed. Driving on the interstate in OD at say 4000 RPM would yield a driveshaft RPM of only about 2600. So you would have to be at near idle to get an equivalent driveshaft speed in 1st gear as you are on the interstate.

Trans gear ratio x RPM = driveshaft RPM



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Last edited by merc123; 06-24-2013 at 04:48 PM.
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post #3 of 8 Old 06-25-2013, 09:34 AM Thread Starter
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thanks, do you know what brand U joint i should put in every autoparts place carries there own except napa and oreilly auto i think its Percision.... thanks again
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post #4 of 8 Old 06-25-2013, 10:07 AM
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I would recommend Spicer. I've used Precision on my race car and haven't had any issues with it but I would still go with Spicer if you can. Rockauto.com carries them.



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'00 F350
Mods: Nitto Trail Grapplers, Diamo 17 Karat wheels, Red-head Steering box, Autometer gauges, Tru-Cool #4739 trans cooler, BFxenon HID lights
'03 Mustang GT
Mods: A bunch. --> Clicky <--

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post #5 of 8 Old 06-25-2013, 06:42 PM Thread Starter
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Ok so I checked the u joints no movement so I put it on flat ground and put it in neutral and no slack. So I put the jack under the rear end and ran the truck between 50-75mph to check everything out.with some help of coarse .... So between 54-58 mph I would hear a roar from the rear end like almost dry bearings or metal on metal kinda then I would run it on up and it would vibrate in the rear. So I checked the drive shaft when I was running it up and it seemed fine. So I pulled the plug on the pumpkin and it had about 1/8th of inch in metal on the plug. So I dipped my finger in the gear oil and there is a lot of metal floating in the oil and it looks like gold flakes. Anymore have an idea what's going on? I have pics and video if it helps let me know!!
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post #6 of 8 Old 06-25-2013, 06:44 PM
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Could be any number of things. Gonna need to pull the cover. Could be broken teeth on ring gear or bearing material



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'00 F350
Mods: Nitto Trail Grapplers, Diamo 17 Karat wheels, Red-head Steering box, Autometer gauges, Tru-Cool #4739 trans cooler, BFxenon HID lights
'03 Mustang GT
Mods: A bunch. --> Clicky <--

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post #7 of 8 Old 07-28-2013, 12:42 PM
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Above post is right, you need to get inside, but at a glance, if you're seeing brass/gold colors, it sounds like a bearing is coming apart somewhere, but if anything is coming apart, everything will start coming apart if you keep running it. Bearing makes sense because it would allow some play in a rotating part, and the only thing that would affect it is terminal speed. I'd think if it was gears, you'd be feeling/hearing it all throughout the range, but as a check before you can really tear into it... jack up one side and rotate the tire with the truck in neutral, this will let you "feel" the gears while the driveshaft spins. Jack up both sides with it in park and you can isolate just the diff spider gears for a feel.

2003' F350 7.3L Lariat Crew-Crab 4x4 6spd Manual Short Bed. 3.73 ratio and that's about all i know... so far.
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post #8 of 8 Old 07-29-2013, 06:01 AM Thread Starter
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Houston Drive TRain

Its was the Bearings in the rear end....Houston drive train put new bearings in and rebuilt the drive shaft and balanced it out for less than 800 dollars.
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