10-08-2013, 01:03 PM
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#1
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30-40 and 65-75mph cyclical moan
so i have this cyclical moan, i can feel and slightly hear it between 30-40 mph and between 65-75 mph seems worst around 67mph
it tends to be a moan and slight gas peddle vibration, no steering wheel shake at all, almost like a harmonic moan at 1 sec. intervals
driving me crazy, cause it's steady as a rock at 50 mph, below 30 mph and above 72mph
I do need and stab bar end link which I am replacing, i'm gonna try rotating the tires (prob to no avail)
any ideas? I had new tires put on but i have no steering wheel shake, could it be balancing?
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10-08-2013, 02:12 PM
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#2
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Harmonic vibration of the drivetrain, probably the front diff:
Driveline Drone on the Freeway - Toyota 120 Platforms Forum
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10-08-2013, 02:57 PM
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#3
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what i don't get is this just started at 155,00 Miles
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10-08-2013, 03:12 PM
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#4
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Quote:
Originally Posted by SureShot516
what i don't get is this just started at 155,00 Miles
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You're lucky. Mine started within 20k.
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10-08-2013, 03:27 PM
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#5
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so i sort of have the same problem but no shaking and it starts at 1mph lol...hopefully its some kind of bearing in the driveline...ive been looking to grease everything up but my drivelines are all sealed up i guess.
can anyone tell me if there have been problems with input and output shaft bearing problems from the diff or transmission?
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10-08-2013, 03:34 PM
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#6
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Quote:
Originally Posted by cleex024
so i sort of have the same problem but no shaking and it starts at 1mph lol...hopefully its some kind of bearing in the driveline...ive been looking to grease everything up but my drivelines are all sealed up i guess.
can anyone tell me if there have been problems with input and output shaft bearing problems from the diff or transmission?
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Wheel bearing gone bad?
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10-08-2013, 03:49 PM
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#7
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Quote:
Originally Posted by M1911
Wheel bearing gone bad?
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i changed out the front bearings and still sounds the same...could be rear i suppose but when it was on the lift i put it in drive and listened and it was coming from the driveline but the sound could be from anywhere and just traveling up the shaft.
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10-08-2013, 05:44 PM
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#8
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SureShot, I'm going with wheel bearings. Have they been replaced?
Mine produced similar symptoms, and the fronts made noise in the lower range And the rear was higher speed. Speed ranges were similar for mine.
Can you get the sound to change by swaying the truck left and right a bit while driving? This may help isolate the noise to a side. It
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10-08-2013, 08:29 PM
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#9
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Quote:
Originally Posted by Greydog
SureShot, I'm going with wheel bearings. Have they been replaced?
Mine produced similar symptoms, and the fronts made noise in the lower range And the rear was higher speed. Speed ranges were similar for mine.
Can you get the sound to change by swaying the truck left and right a bit while driving? This may help isolate the noise to a side. It
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no the sound does not change when i sway from side to side and the steering wheel does not shake at all...however the sound gets louder as there is throttle but when i let off of the gas the sound dies down which is why i think its the drive shaft bearings.
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10-09-2013, 08:25 AM
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#10
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Quote:
Originally Posted by cleex024
no the sound does not change when i sway from side to side and the steering wheel does not shake at all...however the sound gets louder as there is throttle but when i let off of the gas the sound dies down which is why i think its the drive shaft bearings.
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The sound that I have is only evident under constant throttle, like with the cruise control engaged on a flat stretch of highway. As soon as I step on the gas or let off the gas, it goes away.
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10-09-2013, 09:43 AM
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#11
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Mine starts at exactly 63mph and stops around 71mph it happens in cruise control, foot on gas without cruise, and when you let off the gas as it passes that speed range
if i put it in 4th gear it will start once it hits the same 63mph even though RPM's are now higher, you can feel it ever so slightly in the gas peddle and it's a very tight/close feeling vibration/pulse and with the windows up and radio off sounds like a subtle "womp.... womp.....womp.....womp"
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10-09-2013, 11:11 AM
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#12
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Another vote for wheel bearings.
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10-09-2013, 12:50 PM
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#13
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correction i'm at 115,00 not 150K
Wheel bearings expensive?? i have full time 4WD
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10-09-2013, 01:04 PM
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#14
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Wouldn't a bearing be a constant at other speeds not just at 65-70 mph?
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10-09-2013, 11:31 PM
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#15
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Just had my driver side bearing replaced at 48k. Had the same noise going 45-55 mph and then again at 65+. It was covered by the certified warranty so I paid nothing. Noise Went away after it was replaced. There is a vendor here that sells bearings or you can try bluepitbearings.com
Good luck.
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