Can't figure out this noise
Thread Starter
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Senior User
Joined: Jul 1999
Posts: 258
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From: Kingsport USA
Can't figure out this noise
My father in law has 03 (Last year of the 7.3) F250 4dr. I've searched but can't really figure out this noise. We've thought it was a tire noise like if you are running mudders but the more I listen to it I don't think that's it. I don't think it's a u-joint because it's a constant noise. It's really bad when it's around 65-72. When I let off the gas it quitens down quite a bit but is still there. I'm kind of thinking it's a bearing but to me a bearing going bad should be a constant whinning sound. It also goes away when the truck downshifts and the engine jumps to a higher RPM. He's starting to think it may be the OD gear/bearing.
So has anyone experienced this kind of noise?
Edit: It's been a while since I've been here and didn't see the 99-03 SD thread so if someone wants to move this to there feel free.
So has anyone experienced this kind of noise?
Edit: It's been a while since I've been here and didn't see the 99-03 SD thread so if someone wants to move this to there feel free.
Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Mike,
Is it 4 wheel drive?
So - the noise goes away completely when it downshifts?
Have you checked to see if the noise is still there when running 65-70 in a lower gear? If the noise only happens when going that speed and in OD, then he may be right.
Is it 4 wheel drive?
So - the noise goes away completely when it downshifts?
Have you checked to see if the noise is still there when running 65-70 in a lower gear? If the noise only happens when going that speed and in OD, then he may be right.
Postmaster
Joined: Feb 2004
Posts: 2,595
Likes: 0
From: IL
Have you checked the obvious - tires? Try rotating them first and then go from there diagnosing. I've had a tire or two go bad that were fairly new. When rotating and before taking the front wheels off spin them and look dead on down the front of the tire at the tread groove while spinning to see if there is any wobble from something like a broken belt or cord.
My next check would be bearings, hub or wheel.
Good luck
My next check would be bearings, hub or wheel.
Good luck
Thread Starter
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Senior User
Joined: Jul 1999
Posts: 258
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From: Kingsport USA
Splane please!!!
Fordsflylow,
He's rotated the tires and still does it. He's trying to find someone that has a different set that would let him borrow them just to put them on and drive down the road and see if the noise is still there.
Fordsflylow,
He's rotated the tires and still does it. He's trying to find someone that has a different set that would let him borrow them just to put them on and drive down the road and see if the noise is still there.
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FTE Chapter Leader
Joined: Feb 2004
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From: Wayland, MI
How many miles on the truck, and when were the front bearing last replaced. I would lean to that more than transmission. I'm thinkin needle bearings in the wheel bearing assembly.
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Thread Starter
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Senior User
Joined: Jul 1999
Posts: 258
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From: Kingsport USA
I believe it's got a little over 65K but not sure. This is something I was leaning towards until I drove it a while and playing with the speed and RPM's I've kind of ruled them out.
Thread Starter
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Senior User
Joined: Jul 1999
Posts: 258
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From: Kingsport USA
Sorry it's been a while but finally got the noise taken care of.
Took the truck to a shop and the mech. thought it was the front bearings. Tore into it and replaced both sides and still not solve. Come to find out the rear carrier bearing was wore out. Luckily it didn't get the gears. So after a $2000 bill problem solved.
Thanks for all the input guys.
Took the truck to a shop and the mech. thought it was the front bearings. Tore into it and replaced both sides and still not solve. Come to find out the rear carrier bearing was wore out. Luckily it didn't get the gears. So after a $2000 bill problem solved.
Thanks for all the input guys.
Cargo Master
Joined: Dec 2003
Posts: 2,022
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From: Redford, Mi.
Mountain Pass
Joined: Jun 2004
Posts: 133
Likes: 14
From: Massachusetts
I am going thru something very similar. A whirling noise (from underneath, near the center to rear - hard to tell) that changes pitch with wheel speed. Thought it was the rear wheel bearings. Just finished replacing the rear wheel bearings last night to find out that was not that problem. It dose it in all gears and in neutral without a change in noise or pitch, so I ruled out the transmission. I am hoping its the driveshaft u-joint(s) or center bearing, but thinking its a carriage bearing, and dreading its a pinion shaft bearing. It started after the truck was parked for a week at the airport at close to a week of single digit temps. As soon as it started to roll I heard a very small quick dry "crack or snap" and that when it started. At this point, I am ready to take it to Ford for diagnostics, before I just start throwing more parts at it.