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Old 04-17-2013, 02:00 PM
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Hopping/Vibration 45-50 mph

Any help be great... I have a 2012 F250 which just installed a 4in Bds lift with 35's and kept stock wheels. The issue I'm having is around 45-50 mph I feel a constant vibration/hopping in the rear, like a out of balance tire, but I have tires balanced 4-5 times and also changed rear shocks but NO fix to problem. If I go over 50 mph its fine or under 45 its all good...... Installer installed blocks for drive shaft angle....... Any suggestions????
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Old 04-20-2013, 10:35 AM
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Seems that this is something these trucks are known for. I am having the same problem, except that I get the vibration between 55 and 65, usually. Sometimes it is fine, though.

This morning, I tried to check the universals to see if they were worn/dry, but I was unable to get the clips out and I didn't have a socket I needed to unbolt the yoke from the flange, so I bailed for now.

What I did find was that when I pushed up on the driveshaft at the slip joint, I seemed like a lot more movement than I expected and it seemed that either the output flange is a little loose or the bearing in the transfer case is bad. I should know more next weekend.

If anyone reads this, how much play should there be in the output shaft of the transfer case?
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Old 05-16-2013, 03:45 PM
JCZ JCZ is offline
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McMneal, are you taking it to the same shop each time, to get them balanced? If so, you might want to try a different shop.

I had a very similar situation with another vehicle. Finally went to a tire shop instead of the dealership (new dealership...I thought they'd have very reliable equipment) and they balanced the wheels and the problem was gone.
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Old 05-17-2013, 07:25 PM
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There is an entire section in the Ford repair manual dedicated to rear end vibration.

What I took away from it is to:

1. Get your tires balanced.
2. Check the slip joint for easy slipping.
3. Check the universals for any binding.
4. You can index the how the driveshaft mounts to the flange at either end. Do not try to index the slip joint. If you pull the flange bolts, they recommend you replace them.
5. Check the driveshaft for straightness. Max of .02" runout at either end or middle.

I would post the verbiage, but I do not want to violate any copyright.
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