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Discussion Starter #1
Hello,
In the past few weeks I've noticed (with increasing frequency) a whirring/squeal sound coming from the rear end area of my '99 Pre-Runner V6 AT truck.

The symptoms are that it happens only above about 40 mph and ONLY when I take my foot OFF the gas. Then, I start to hear this sound (kind of a high pitched whining sound - but it does sound like metal-on-metal).

If I accelerate again, the sound immediately stops. But, if I take my foot off the gas, back the sounds comes. When I go under about 40mph, the sound goes away completely.

Has anyone seen a problem like this before? Would greatly appreciate any tips!

Thanks,
Brad
 

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try checking your carrier bearing, it should only have about 1/4" of play. if it has more than that, replace it
 

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gear whine

BVOSTON said:
Hello,
In the past few weeks I've noticed (with increasing frequency) a whirring/squeal sound coming from the rear end area of my '99 Pre-Runner V6 AT truck.

The symptoms are that it happens only above about 40 mph and ONLY when I take my foot OFF the gas. Then, I start to hear this sound (kind of a high pitched whining sound - but it does sound like metal-on-metal).

If I accelerate again, the sound immediately stops. But, if I take my foot off the gas, back the sounds comes. When I go under about 40mph, the sound goes away completely.

Has anyone seen a problem like this before? Would greatly appreciate any tips!

Thanks,
Brad

I heard that sound on my 90' Yota right b4 rearend locked up, LOL!!! I'd check the carrier bearing and the rear diff. Good luck, Wes
 

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Wheel bearing maybe.. That the sound mine made when one was going out. It just got louder and louder..
 

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Discussion Starter #5
Today (the day I had an appointment at the differential specialist shop) it completely stopped making this noise (arggh!).

Anyway, the guy drove it, put it on the rack and checked the u-joints, tightness of the pinion bearing, etc. Said everything was just right. He couldn't reproduce the sound, but said that if a rearend is going out, it would make a sound all the time - it would not be intermittent.
Is this what you guys have seen?

Driving it home today - no sounds. Hmm... Not sure what to check next?!!?

Thanks for your tips.
 

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rearend!

BVOSTON said:
Today (the day I had an appointment at the differential specialist shop) it completely stopped making this noise (arggh!).

Anyway, the guy drove it, put it on the rack and checked the u-joints, tightness of the pinion bearing, etc. Said everything was just right. He couldn't reproduce the sound, but said that if a rearend is going out, it would make a sound all the time - it would not be intermittent.
Is this what you guys have seen?

Driving it home today - no sounds. Hmm... Not sure what to check next?!!?

Thanks for your tips.
that's strange, b/c right b4 my rearend locked up, when I was on the gas, I couldn't hear the sound. When I let off, I could hear it, LOUD!! Good luck anyways, Wes
 

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Hey Wes. Thanks for the info on that. Actually, I should have said that the guy told me if it happened intermittently it wasn't the rear end. He did confirm that if I hear it on deceleration (all the time), it could well be a bearing inside the diff that's about to give. But, unfortunately, this one is gonna be hard to track down.

Funny part is that the last two mechanics have told me the same thing after they couldn't find it - to hope it breaks something soon, and then will know what the real problem was!
 

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rearend

BVOSTON said:
Hey Wes. Thanks for the info on that. Actually, I should have said that the guy told me if it happened intermittently it wasn't the rear end. He did confirm that if I hear it on deceleration (all the time), it could well be a bearing inside the diff that's about to give. But, unfortunately, this one is gonna be hard to track down.

Funny part is that the last two mechanics have told me the same thing after they couldn't find it - to hope it breaks something soon, and then will know what the real problem was!

ok, now that makes sense. Cause that's what happened to mine, it was an internal bearing in my rearend. But, you're right, if it breaks, you've finally narrowed it down, LOL!! Good luck, Wes
 

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My 2000 trd auto v6 with 70,000 miles has been doing this for the past week. Going above about 30 mph when I let off the gas I get this squeaking sorta noise from the rear. But it sounds like its from the rear passenger side of the truck...but maybe its from the rear differential. I heard it could be a wheel bearing.....but now maybe its the rear differential? How do i determine if its the bearing or from the diff?
 

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noises!

ootsabryan said:
My 2000 trd auto v6 with 70,000 miles has been doing this for the past week. Going above about 30 mph when I let off the gas I get this squeaking sorta noise from the rear. But it sounds like its from the rear passenger side of the truck...but maybe its from the rear differential. I heard it could be a wheel bearing.....but now maybe its the rear differential? How do i determine if its the bearing or from the diff?

If I were you, I'd get some1 to drive the truck and you sit in the back and let them go about 30 and you just try and see if you can narrow it down to the passenger side rear or if it sounds like it's coming from the diff. Other than that, you could just change both rear wheel bearings for shitz and giggles, haha! Then, if you still hear it, pull the 3rd member and see what you can come up w/. Peace, Wes
 

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Ive just started hearing this noise too, Its very quiet right now but you can hear it. I only have about 68K on mine. Let me know if you determine what is making the noise
 

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i have a sound also. it is a hollow screeching sounding kind of like a couple of springs scraping on the brake drumb. but i'm fairly sure it's not from the gears. i've had this sound for a long time maybe a year it seem'd to return with the cooler weather.
it only happens when the vehicle is cold- first thing in the morning or after its been sitting for a while. i just discovered the right seal is leaking so i might go after the bearing when i replace the seal. close to 150k on mine.

check over on the 4x4 page, there seems to be a simular discussion (burried deep, many pages deep). could be u joints?.
 
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