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Humming noise at certain speeds?

 
  #1  
Old 08-13-2007, 07:27 PM
Mako254
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Humming noise at certain speeds?

Hey everyone, by the way I love this site. I just purchased a 2001 F250 2wd crew cab lariat with the 7.3L. The truck has about 170,000 miles and seems to be in really good shape. I paid $11,000 for the truck, which seems like a pretty good deal. The truck has no mods done to it, electrical or mechanical. The engine runs extremely strong, but the truck has a speed related humming sound coming from the front of the truck. It sounds like it's coming from the left side, but I could be wrong. The sound starts at about 35mph and stops at around 45 or so, but you can faintly hear it until about 50. I've tried turning the overdrive off and it starts at the same speed. I've also put the truck in 2nd and the humming still starts at about 35mph. The sound only happens under acceleration, as soon as you stop accelerating it goes away.

I've read quite a few post about similar problems, but none really fit my exact symptoms. I'm hoping for something like wheel bearings, but it's never that easy....

Thanks in advance for any help. I really like the truck, but the noise is really aggrevating and happens at a very common speed.

Richie
 
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Old 08-13-2007, 08:16 PM
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Can you feel it in on the floor with your feet or thru the steering wheel? You could try jacking up the front and spining the tires by hand.
 
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Old 08-13-2007, 09:46 PM
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thats funny mako, I just bought a '01 f250 lariat crew cab for 11,000 with a hum at 40 mph and shakey cornering on exceleration. I fixed mine, it was a carrier bearing. could also be u-joints or wheel bearing.
 
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Old 08-13-2007, 10:29 PM
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Yes, I can feel it through the wheel and pedal, but just slightly. I have not jacked the truck up and spun the wheel yet, but I'll probably check that tommorrow. The truck does not act funny while turning, no shakes or vibrations. I'll keep my fingers crossed and hope that it's only a bearing. If anyone else has some suggestion or experience with a similar experience, let me know about it.
Thanks, Richie
 
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Old 08-13-2007, 10:37 PM
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Possibly a stuck caliper slide pin and lightly dragging brakes. If 4X4 the hubs are unlocked, correct?
Opps, sorry, just reread that its a 2wd
 
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Old 08-16-2007, 07:44 PM
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Update: I jacked up the left side and spun the wheel, but it did not feel rough or make any funny noises. There was no side to side play or slop either. The brakes were not dragging at all either. If my humming noise starts at about 35mph, would I feel anything by just spinning the tires? It's definitely not tire humming....Please give me some ideas, could it still be the bearing even though I can't feel anything while spinning the tire?
Thanks again,
Richie
 
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Old 08-16-2007, 10:55 PM
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Check rear carrier bearing on the driveshaft.
 
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Old 08-17-2007, 08:59 AM
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Old 08-17-2007, 08:33 PM
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I'd start by rotating the tires since that's simple and cheap. I'd also check out the front wheel bearings (guzzles link on the 4wd won't help much). I can't comment on the carrier bearing since I have never had one go bad, but wouldn't a bad carrier bearing exhibit the symptoms at different speeds? Like each time the drive shaft hit a certain rpm range as the transmission shifted through gears?
 
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Old 08-17-2007, 09:02 PM
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....o K......
 
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Old 08-18-2007, 06:14 PM
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I'm gonna probably go ahead and replace the carrier bearing in the next few days, just in case. While I'm at it, I guess the u-joints and greasing the splines will also get done. I don't have a shop manual yet, but I'm thinking the splines are underneath the rubber boot? The boot is missing one of it's clamps, and as far as I can see there is no lube at all in there. When I come to a complete stop there is a silent but noticable "thump" feeling, it also happens when I take off. The sound is not a audible "clank", you feel it more than hear it. I'm hoping that would be the spline causing that.

thanks again guys, I'll keep you informed
 
 
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