Vibrations around 10mph, between 40-45 and above 70 mph - Ford Powerstroke Diesel Forum
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Old 10-19-2013, 07:09 PM
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Question Vibrations around 10mph, between 40-45 and above 70 mph

I have had a vibrations for the the past 30,000 miles. The vibration is coming from the rear end. The vibrations around 10 mph has a high frequency with a low amplitude. The vibrations between 40-45 mph and above 70 mph feels like wheel hop. I have changed tires, had the tires rebalanced twice, u-joints, carrier bearings, replaced every bushing under the truck, and serviced rear end. Tranny fluid is fine, truck runs great. Does anyone have any idea what the issue could be?
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Old 10-20-2013, 11:06 AM
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Maybe check to see if you have a warped brake rotor/hanging caliper. You could get the drive shafts balanced too
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Old 10-22-2013, 06:14 AM
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I'll take a look this weekend. Although the vibs are present with the brakes on or off with no change to magnitude. But at this point I will try anything.
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Old 10-27-2013, 04:50 AM
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Checked brakes yesterday. Right rear brake is frozen. Looks like it is causing most of the vibrations. I will know for sure when I replace it. Probably gonna have to replace the rotor as well.
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Old 10-27-2013, 04:55 AM
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Glad you found it!
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Old 10-27-2013, 04:59 AM
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Thanks for the help.
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Old 11-03-2013, 05:12 AM
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Well replaced the brake caliper. It fixed one of the vibrations. But the others still remain. The only thing I have not tried yet is Ford's friction modifier for the differential.
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Old 11-03-2013, 05:20 AM
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Glad part of the issue was solved. I still suspect a drive shaft issue (or as everyone wants to call them, drive line). Try greasing the slip yoke. If vibration still exists after that, take it to a shop and get it balanced
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Old 11-03-2013, 05:51 AM
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I will try greasing the slip yoke first. Have you already encountered this problem before?
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Old 11-03-2013, 06:09 AM
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I haven't encountered this problem on my super duty, but I have on other vehicles. The slip yokes on the super dutys are common issues, but are usually more of a clunk type of thing. But greasing it is free, so it's worth a try in my opinion. It seems like you have pretty much eliminated everything else. I have seen an unbalanced driveshaft crack open a transfer case, so it may be worth the few bucks to take it to a shop and have the balance checked on it.
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