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Old 04-10-2009, 11:16 AM
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sporadic vibration

I have a "sporadic vibration" that occurs about 50mph and will progressively get worse until about 65mph. It is a 2004 F150 4x4 and it only has 20k on it. Tires and u-joints seem ok. The vibes come from the rear as it is only felt through the floor and in the seat. I figured if it was wheel balance it would do it all the time?? This just started and like I said, it is sporadic. Any clues??

Thanks,

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Old 04-10-2009, 05:11 PM
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Quote:
Originally Posted by hughj
I figured if it was wheel balance it would do it all the time??
Actually, no. Most times there will be a speed range that'll be bad, at other speeds, the imbalance will disappear.

Get them balanced, IMHO.
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Old 04-10-2009, 05:19 PM
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do you notice alot of shake in your bed.watch through your driver mirror and see of it is shaking when you are feeling the vibration. cole
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Old 04-10-2009, 06:21 PM
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It could be a few things, is it only on acceleration? Or cruise at those speeds They had problems with the e-brake hanging up also. Also did the rear u-joint have circlips or was the u-joint staked in? I dealt with alot of vibrations on those at the dealership.
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Old 04-10-2009, 07:52 PM
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I'll take a closer look at the u-joints and check the e-brake.
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Old 04-10-2009, 08:32 PM
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You may have to unbolt the driveshaft from the rear yolk, just because it feels tight doesn't always means it's good, if it gets a tight spot in the u-joint it can vibrate. 12 point 12mm socket or wrench will work for the bolts. Just mark the location between the end and the rear end yolk so you bolt it back up in the same location.

The e-brake could be a few things either the pivot going thru the backing plate is siezed or it could need the cables replaced. There was a tsb for the new body style f-150(2004 still had both the old (heritage edition) and new style) this tsb requires replacing both rear cables. There was few other things included also I could get into detail if thats what it comes down too. I would want to check with your vin # to make sure it applies to your truck though. You can pm if you don't want to post it here.
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Old 04-10-2009, 08:32 PM
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Your 2004 truck has only 20K miles on it in 5 years? I would suspect it sit's for long periods of time. If it does not have a Camper on it, and the bed is empty, in other words light in the rear, inspect your rear tires for weathering, or flat spots. One of the two rear tires could have a 'blemish', or thrown a balance weight.

I would not rule out a tight ujoint.
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Old 04-10-2009, 09:08 PM
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Yeah, forget the tires. I just had mine balanced in the front- I had a shimmy in the steering wheel that began at ~ 48 mph and stopped at ~ 55, so that is fresh on my mind.

But w/my Jeep, the difference was great!

You can tell sometimes if you have a u-joint going out by holding the brake and shift between forward and reverse, back and forth. If it's bad you might hear it.
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Old 04-10-2009, 09:31 PM
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Quote:
Originally Posted by cobalt327
Yeah, forget the tires. I just had mine balanced in the front- I had a shimmy in the steering wheel that began at ~ 48 mph and stopped at ~ 55, so that is fresh on my mind.

But w/my Jeep, the difference was great!

You can tell sometimes if you have a u-joint going out by holding the brake and shift between forward and reverse, back and forth. If it's bad you might hear it.
Don't you mean 'forgot', or was it, don't "forget" the tires?
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Old 04-10-2009, 10:45 PM
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Quote:
Originally Posted by carsavvycook
Don't you mean 'forgot', or was it, don't "forget" the tires?
Forget the tires- as in never mind.
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Old 04-11-2009, 01:55 AM
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Vib

This happened to me once it was a chunk of mud on the back side of one of the wheels or maybe there wheel alignment machine wasn't balancing correct.
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Old 04-11-2009, 08:17 AM
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Quote:
Originally Posted by carsavvycook
Your 2004 truck has only 20K miles on it in 5 years? I would suspect it sit's for long periods of time. If it does not have a Camper on it, and the bed is empty, in other words light in the rear, inspect your rear tires for weathering, or flat spots. One of the two rear tires could have a 'blemish', or thrown a balance weight.

I would not rule out a tight ujoint.


20k is correct. It usually only gets used for hunting or trailering my Camaro except for the occasional trip to Lowes' or Home Depot. There was no mud that might have fallen off because the truck was clean and the underbody pressure washed from hunting season. I'll re-visit the driveshaft and re-balance the tires to absolutely rule them out.
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