Humming noise
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New User
Joined: Mar 2004
Posts: 6
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From: Riverside, CA
Humming noise
I bought a 02 PSD crew with 29000miles recently, while driving it with the overdrive off and going about 30 MPH II noticed a humming noise that last until the speed goes up to 40 MPH and about 1500 rpm. While it the overdrive is engaged you still hear it but at the speed of 50-60 miles. I took it to the dealer and they kept it for three days and still can not figure it out. A coworker that is a good maintenance mechanic said that it could be the torque converter as it engages.
Any Ideas?
Any Ideas?
Elder User
Joined: Feb 2003
Posts: 673
Likes: 0
From: Virginia
it sounds like its engine speed, not road speed related, right?
The torque converter shouldnt take long to lock up, it should be like a gear change.
How does the trans fluid look/smell? Is it full?
If its the orgional fluid, its probably time to change it.
It could be as simple as old fluid.
The torque converter shouldnt take long to lock up, it should be like a gear change.
How does the trans fluid look/smell? Is it full?
If its the orgional fluid, its probably time to change it.
It could be as simple as old fluid.
Freshman User
Joined: Nov 2002
Posts: 47
Likes: 0
Im not a pro by any means but from past issues with the trucks Ive owned the only humming noise that accualy led to a problem was the wheel bearings going out in the front end or the universal joints. It usauly starts with a hum then a vibration. Like I said im no pro but worth a look.
Tuned
Joined: Jun 2004
Posts: 275
Likes: 9
From: San Antonio
A tire out of balance can cause vibrations at various speeds, before you go to the tire shop, check for a rock stuck in the tire(s), it happened to me right after a rotation and balance at the dealer. I took it back claiming they didn't properly balance the tires and the tire tech walked out and pick some large gravel out of my left rear tire. Problem went away... still trying to get the taste of foot out of my mouth.
Elder User
Joined: Feb 2003
Posts: 673
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From: Virginia
big red, make sure the driveshaft is ok. Check all weights and make sure there is not too much runout.
my dads got the same problem with his suburban, i rebalenced his tires with a road force balencer and it took care of alot of it, but he still has some. I think its his driveshaft. (about 70 mph or so)
my dads got the same problem with his suburban, i rebalenced his tires with a road force balencer and it took care of alot of it, but he still has some. I think its his driveshaft. (about 70 mph or so)
Laughing Gas
Joined: Jan 2004
Posts: 807
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From: Prince George, BC
f350xlt460, what do you mean by too much runout, i have never heard that before. i thought it was a bad ujoint accutally so i took the drive shaft off and was going to change them and everything was good, so i put it back on. maybe i will try balancing the tires again.
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Elder User
Joined: Jul 2004
Posts: 849
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From: Leesburg , Fl.
What f350 is talkin' about is the diveshaft not being true or staight , but has a slight bow . As long as it's within tolerences ( run out ) it should be ok but if it's out side ( too much bow ) it will set up a vibration that will destroy the universal joints .l
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Junior User
Joined: Feb 2004
Posts: 98
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From: Colorado
While not directly related to the question, I think this story is humorous.
A few years ago my father bought an almost new GM Safari van that I first test drove for him. I noticed a funny humming sound at 50-60mph but everthing else was fine and the price was good. I told him to buy it but have the humming looked into as a warranty issue (very low miles). After two different times to the dealer over several months which included the replacement of the rear axle and replacement of the driveshaft and all associately muffler bearings, one mechanic decided to get his head out of the book and look around to see if he could find the source of the problem. He found a bungee cord running between two frame members up near the floor by the driver. It was the type that would have been used on the factory floor for some reason and definitely not anything you would purchase at Walmart. The dealer sent it and a note to GM in their request for payment for their efforts.
A few years ago my father bought an almost new GM Safari van that I first test drove for him. I noticed a funny humming sound at 50-60mph but everthing else was fine and the price was good. I told him to buy it but have the humming looked into as a warranty issue (very low miles). After two different times to the dealer over several months which included the replacement of the rear axle and replacement of the driveshaft and all associately muffler bearings, one mechanic decided to get his head out of the book and look around to see if he could find the source of the problem. He found a bungee cord running between two frame members up near the floor by the driver. It was the type that would have been used on the factory floor for some reason and definitely not anything you would purchase at Walmart. The dealer sent it and a note to GM in their request for payment for their efforts.
New User
Joined: May 2004
Posts: 23
Likes: 0
From: Austin,TX
mine also hums
comes and goes
A mechanic i know says it is probably the pump in the tranny straining against dirty filter
I need to change fluid and filters but haven't had time.
will let you know if solves problem
comes and goes
A mechanic i know says it is probably the pump in the tranny straining against dirty filter
I need to change fluid and filters but haven't had time.
will let you know if solves problem
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