Transmission hum
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Joined: Jul 2003
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From: Greenwood, IN
Transmission hum
I have a 2000 f-150 SB. I bought it 4 weeks ago, has 45K miles on it.. It has a low hum between 56-61 MPH in overdrive, around 16K-17K rpm. Runs great, no idea if the trans. fluid has ever been changed. The low hum and vibration almost puts you to sleep in this speed range. Runs and sounds good at all other speeds and rpm's. Help
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New User
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From: Greenwood, IN
Transmission hum
Yes, I think I have ruled out the tires. If I drop out of cruise control at 60 mph, and begin coasting down the hum goes away immediately, it appears to be only when actually using the overdrive.
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Joined: May 2003
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Transmission hum
Check you differential fluid, my 97 F150 had to same symptoms, and the differential 1 1/2 pints low. If you have a limited slip, make sure you use only synthetic multi-weight oil with limited slip conditioner(you have to mix the two together).
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Joined: May 2003
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Transmission hum
Take your numbers off the tag in the door jamb on the drivers side, it will have an axle code and transmission code and so on. A Haynes Repair Manual will have an axle and transmission codes in it. There is also a tag on your differential that tells you what kind of diff it is.
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New User
Joined: Jul 2003
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From: Greenwood, IN
Transmission hum
Thanks, I did check the differential and found it to be a quart low. I still have the noise, but today the engine is missing out, it happens to be a rainy wet day. Now that I have serviced the transmission and differential, I am thinking the engine is missing causing the sound I am hearing between 56 and 61 mph. I think I will tackle the obvious on the engine. Things like plugs, fuel filter, and plug wires. Thanks for your help.
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New User
Joined: Jul 2003
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From: Greenwood, IN
Transmission hum
Ended up taking it to the local Ford dealer for service. After 2 days they diagnosed the noise and vibration as a bad rear exhaust dampner. They replaced it and $291 later the noise and vibration is still there. They ruined my new floor mat getting in and out during testing. Now squabbling with Ford, most liklely won't win.
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Joined: May 2003
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From: Kapaa, Hawaii
Transmission hum
So what was the noise, I have a low pitch noise also, but mine has to do with all the roof and cab panels resonating at certain rpm for tire. I just drive and it kicks in at certain range. but you can difinitely feel the resonation "pulses" in rhythm. you can tell if tires are doing it by driving on dirt road. the softness should throw off that range. if not could it be WHEEL BEARINGS ???
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New User
Joined: Jul 2003
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From: Greenwood, IN
Transmission hum
The Ford dealer has replaced the ring and pinion and a bunch of other stuff inthe rear differential and after ($1400 of their money), it still has the vibration between 56-61 mph, 1700 RPM in overdrive. Next they want to tear into the front differential at my cost.
Post Fiend
Joined: Jun 2003
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From: NE Texas
Transmission hum
Originally posted by hutch99
Yes, I think I have ruled out the tires. If I drop out of cruise control at 60 mph, and begin coasting down the hum goes away immediately, it appears to be only when actually using the overdrive.
Yes, I think I have ruled out the tires. If I drop out of cruise control at 60 mph, and begin coasting down the hum goes away immediately, it appears to be only when actually using the overdrive.
1 - carrier bearing
2 - u-joint
3 - wheel bearing
4 - tires (still stuck on that - somewhat)
5 - pinion bearing (unless they replaced that too)
Also - does it vibrate under load as well as coasting in overdrive in that speed range?
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From: Greenwood, IN
Transmission hum
Big Orn,
I tested it again last night, at 56-61 mph in overdrive the noise and vibration is there, in 3rd gear at the same speeds it's there also, only at a different frequency because of the higher RPMs, but it's still there. Everything is very smooth at all other speeds, you can't even hear it running. I don't mean it's shaking, the sound is more like the engine laboring. In overdrive the sound is like driving over rumble strips at those speeds. Thanks for the help.
I tested it again last night, at 56-61 mph in overdrive the noise and vibration is there, in 3rd gear at the same speeds it's there also, only at a different frequency because of the higher RPMs, but it's still there. Everything is very smooth at all other speeds, you can't even hear it running. I don't mean it's shaking, the sound is more like the engine laboring. In overdrive the sound is like driving over rumble strips at those speeds. Thanks for the help.
Post Fiend
Joined: Jun 2003
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From: NE Texas
Transmission hum
I really hope someone with more auto tranny knowledge than I have will jump in here, but with the symptom you describe - "Still there but at a different frequency because of the RPM's" - would suggest the front half of the tranny, like a bearing or loose torque converter. If the RPM's of the motor determines the rumble/vibration, and if the motor is not misfiring, and the pulleys/belts/fan/pumps are good, then all I can think of is the front half of the tranny.