Extremely loud humming while driving
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Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
Extremely loud humming while driving
Evenin guys,
Question here on my '94 F150 4x4 5spd.
This is my winter beater, and has very aggressive stock size old style mud/snow tires on it, and they are quite noisy tires, however last couple days, above 50mph, theres this extremely loud deep deafening humming sound that starts right at 50mph, and at 55 when it's at it's worst, I can't even hear the radio blasted.... yea that bad. When it starts making that incredible sound, the truck starts having this very minor driveline vibration. I'm guessing it's a driveline vibration as it's speed related, engine RPM does not change this vibration or loud hum at all.
It does have Auto hubs on it if that makes any difference.....
Now reading through old posts, i've seen a couple guys have said a stuck on hub could be noisy, this sound right?
Everything is tight in the front end, including the rear pinion bearing witch I just checked tonight, and ALL U-joints on the truck, including the front axle ones are all new.
Any ideas? Truck only has 98k miles on it.
Question here on my '94 F150 4x4 5spd.
This is my winter beater, and has very aggressive stock size old style mud/snow tires on it, and they are quite noisy tires, however last couple days, above 50mph, theres this extremely loud deep deafening humming sound that starts right at 50mph, and at 55 when it's at it's worst, I can't even hear the radio blasted.... yea that bad. When it starts making that incredible sound, the truck starts having this very minor driveline vibration. I'm guessing it's a driveline vibration as it's speed related, engine RPM does not change this vibration or loud hum at all.
It does have Auto hubs on it if that makes any difference.....
Now reading through old posts, i've seen a couple guys have said a stuck on hub could be noisy, this sound right?
Everything is tight in the front end, including the rear pinion bearing witch I just checked tonight, and ALL U-joints on the truck, including the front axle ones are all new.
Any ideas? Truck only has 98k miles on it.
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
I had a similar noise/vibration on my 84 F250. To find it, I raised the rear tires off ground and blocked the front wheels. Then spun up the drive train to find where the noise was coming from. Turns out it was a bad(defective new) u-joint I replaced few months ago.
If noise is not present, then its probly in the front drive train or bad tires(ply separation).
If noise is not present, then its probly in the front drive train or bad tires(ply separation).
Lead Driver
Joined: Feb 2013
Posts: 5,006
Likes: 72
From: Roseville, MN
Stuck hubs shouldn't be noisy, but they often are. It's not that the hub itself is noisy, but a stuck hub will spin the front axle, and if there's a bad U-joint or anything else going on in the front end it can make noise.
To check for a stuck hub jack up each front wheel (one at a time is fine) and spin it. The axle shouldn't turn. If it does try turning the tire the opposite direction which should disengage the hub. If it doesn't doesn't you definitely have a sticking hub.
Alternatively you can just drive the truck while someone watches the U-joints in the knuckles. It's not the easiest to see the U-joints while the truck is moving, but one stuck hub won't necessarily spin the driveshaft so you can't look for that.
By the way, I used to have a '95 F-150. The front driveline in that truck always howled like a banshee at speeds over about 50 mph. I chased it and had two different garages dig into it. Never did find the problem. So like I said, stuck hubs can be noisy!
To check for a stuck hub jack up each front wheel (one at a time is fine) and spin it. The axle shouldn't turn. If it does try turning the tire the opposite direction which should disengage the hub. If it doesn't doesn't you definitely have a sticking hub.
Alternatively you can just drive the truck while someone watches the U-joints in the knuckles. It's not the easiest to see the U-joints while the truck is moving, but one stuck hub won't necessarily spin the driveshaft so you can't look for that.
By the way, I used to have a '95 F-150. The front driveline in that truck always howled like a banshee at speeds over about 50 mph. I chased it and had two different garages dig into it. Never did find the problem. So like I said, stuck hubs can be noisy!
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Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
The trucks rear driveshaft is as short as the front one, it's a shorty truck, reg cab short bed.
While doing 50-55mph I swerved the truck side to side, and when I swerve turning right the noise completely goes away, it goes away when I take the load off the passenger side bearing, and gets way worst if I swerve left putting more load on the pass. side bearing.
I drove the truck in 4wd, and the noise is still there but MUCH quieter in 4wd.
I'll check it out tomorrow if it doesn't rain and check what's going on in there.
While doing 50-55mph I swerved the truck side to side, and when I swerve turning right the noise completely goes away, it goes away when I take the load off the passenger side bearing, and gets way worst if I swerve left putting more load on the pass. side bearing.
I drove the truck in 4wd, and the noise is still there but MUCH quieter in 4wd.
I'll check it out tomorrow if it doesn't rain and check what's going on in there.
Laughing Gas
Joined: Oct 2014
Posts: 946
Likes: 186
From: Carnation, Wah
Hmm, that makes me now think wheel bearing, either front or back.
See how they feel if you jack it up and spin each wheel...
hth
t
See how they feel if you jack it up and spin each wheel...
hth
t
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Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
Well now, took my factory auto locking hubs off....it involved a hammer cause the seal was gone, and it was dry and rusting on the inside, once that came out, the bearings made that same hum noise turning them by hand with no wheel on it, as I hear on the road.
I took the rotor off with the bearings, and yep, water has gotten in there, grease was rust color, and bearings are worn, inner bearing is all pitted.
Everything on the drivers side looked and felt fine, but i'm doing one side, do the other as well.
So got new bearings and new Warn lock hubs, gonna put all that together tomorrow.
I took the rotor off with the bearings, and yep, water has gotten in there, grease was rust color, and bearings are worn, inner bearing is all pitted.
Everything on the drivers side looked and felt fine, but i'm doing one side, do the other as well.
So got new bearings and new Warn lock hubs, gonna put all that together tomorrow.
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Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
Well, new Warn lock hubs, new bearings and seals, and wow it drives like a dream now. Tires make a very light noise but nothing like before. For 3 years I though those tires were making all that noise, all this time was bad bearings.
On a side note, I changed the oil in the M5OD, and wow it also shifts super smooth now to.
Truck goes down the road like a new car now!
On a side note, I changed the oil in the M5OD, and wow it also shifts super smooth now to.
Truck goes down the road like a new car now!
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