95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

Diagnostic help

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Old Oct 22, 2018 | 05:52 PM
  #1  
Rpc1rpc's Avatar
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From: Chicago, IL
Diagnostic help

Yes I've searched, any help with diagnosing is appreciated.

Things I know:
  • CV axles okay
  • Potential leak in rack and pinion, but power steering fluid consistently full
  • New sway bar linkages
  • New brakes
  • Drive shaft greased
  • No visible issues
  • Nothing noticeably loose
Symptoms:
  • Terrible forward shaking (in steering wheel?) at 20 mph and above
  • At speed, forward loud squeal, when removing foot from accelerator pedal, but stops when accelerator is pressed again.
  • Press clutch pedal, squeal and steering wheel shake disappear.
  • Coast in neutral, squeal and steering wheel shake disappear
  • Low speed decelerate, forward clunking up
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Old Oct 22, 2018 | 06:25 PM
  #2  
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Have you checked the wheel bearing? The “squeal” and vibration together makes me think wheel bearing. If you have a stethoscope turn the wheel and listen for grinding/noise. By the sound of it, if it’s a bearing causing all that trouble it should be audible just with your ear.
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Old Oct 22, 2018 | 06:29 PM
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Thommo Thompson's Avatar
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I recon its the needle bearings in the front axle. there are even products out there to replace the needle bearings with just a shell bushing thing.
https://eastcoastgearsupply.com/i-85...e-bearing.html

When you hit the clutch, drive is disengaged and everything is free to do its own thing. same when accelerator is let go.
Clunking would probably be worn bushes in the suspension and knuckle area, which have possibly worn out because of the needle bearing vibration.
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Old Oct 23, 2018 | 09:29 PM
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From: New Jersey and Sao Paulo
Originally Posted by Thommo Thompson
I recon its the needle bearings in the front axle. there are even products out there to replace the needle bearings with just a shell bushing thing.
https://eastcoastgearsupply.com/i-85...e-bearing.html

When you hit the clutch, drive is disengaged and everything is free to do its own thing. same when accelerator is let go.
Clunking would probably be worn bushes in the suspension and knuckle area, which have possibly worn out because of the needle bearing vibration.
My needle bearing was reduced to shards of metal. I had just a slight vibration, nothing like what OP reports. There is more than that going on. (There is only one, on the driver side. The pax side is a beefy ball bearing, and usually not a problem.)

Last edited by TheDurk; Oct 23, 2018 at 09:31 PM.
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Old Oct 23, 2018 | 10:00 PM
  #5  
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Well hang on, just because yours failed and didnt cause these issues, doesnt mean all failures are exactly like yours. A complete failure like yours gets everything out of the way, but a worn part grabs and releases a bit like a sprague clutch.
Id say it would be wise to check it out, but dont get fixated on it.
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Old Oct 24, 2018 | 08:18 AM
  #6  
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From: New Jersey and Sao Paulo
Originally Posted by Thommo Thompson
Well hang on, just because yours failed and didnt cause these issues, doesnt mean all failures are exactly like yours. A complete failure like yours gets everything out of the way, but a worn part grabs and releases a bit like a sprague clutch.
Id say it would be wise to check it out, but dont get fixated on it.
Except that I researched that particular fail when it happened to me and I read LOTS of experiences just like mine and NONE like his, so I stick by my position.

In any case, it remains a possibility, but he should expect to find other problems as well. I think that's fair.

Last edited by TheDurk; Oct 24, 2018 at 08:20 AM.
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Old Oct 24, 2018 | 01:38 PM
  #7  
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I respect and appreciate ur confidence, but its just so simple to check. Its litteraly a matter of wobbling and twisting the inner driveshaft cv housing and listening and feeling for noise and freeplay.
its the steering shake on engine brake deceleration that suggests fron driveline. But someone already said wheel bearings, thats the first place id look, but its already been mentioned.
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Old Oct 26, 2018 | 06:38 PM
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From: Chicago, IL
All,

Thank you for the insights!
I'm pretty sure it's the needle bearing, and am going to try the shell bushing conversion.

Part is ordered, I'll post an update once it's in.

Rpc1rpc
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