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Old 06-09-2013, 05:51 AM
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Weird humming sound

So I have a 2004 f350 and when going down the highway between the speeds of 75mph and 85mph there is what sounds like a humming sound coming from either the motor or the tranny. If I let off the gas it goes away instantly. It doesn't do it any at any other speed, the faster the rpm the louder it is but only between 75mph and 85mph when I hit 85mph it magically goes away. It's really got me perplexed as to what could be causing it. Any advice or info would be greatly appreciated. For what it's worth the truck only has 103,000 on it.
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Old 06-09-2013, 10:52 AM
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carrier bearing on the driveshaft?
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Old 06-23-2013, 04:01 AM
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So I checked the carrier bearing and it was shot, replaced it and the sound is still there. Any other suggestions, thanks
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Old 06-23-2013, 04:37 AM
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If your carrier was shot at 103k you may want to go ahead and do u-joints and get it rebalanced. They may be not be any play, but maybe one is starting to seize. Sometimes you could have just a little imbalance and vibrations, at times, can come in at different harmonics. Like you mention at different speeds it comes and goes. Fwiw stick with OEM Spicer u-joints. Your in the same boat I am with a cclb so were stuck with a 2 piece drive shaft.

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Old 06-29-2013, 03:29 AM
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Quote:
Originally Posted by hucorey View Post
If your carrier was shot at 103k you may want to go ahead and do u-joints and get it rebalanced. They may be not be any play, but maybe one is starting to seize. Sometimes you could have just a little imbalance and vibrations, at times, can come in at different harmonics. Like you mention at different speeds it comes and goes. Fwiw stick with OEM Spicer u-joints. Your in the same boat I am with a cclb so were stuck with a 2 piece drive shaft.

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This...

Those vibrations can cause a hum noise
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Old 07-03-2015, 07:02 AM
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I have kind of the same issue in a 2004 F-250. It happens as soon as it shifts into OD and continues until I let off of it or stop, then as soon as it hits OD, it starts again. I just got the truck yesterday, and have to work all weekend, so can't check it right away. Could this be the same thing, or a tranny issue?
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Old 08-27-2015, 06:44 AM
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Turns out, the right front hub was frozen in the locked position, and there was a bad U joint on the front drive shaft. The front drive shaft spinning, even though it wasn't under power was enough to cause a bad vibration.
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