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Discussion Starter #1
For those that have replaced the rear wheel bearings - what kind of noise did you hear, and was it only at a certain speed or condition?

My car makes a humming noise from the rear while off the gas and coasting, below 40 MPH. It used to just do it on curves, but now all the time.

I did add a TRD diff last winter, and I am hoping the noise isnt coming from the pinion bearing.

Thanks,
Al
 

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When my rears went bad, the only noise was that "typical" high pitched metal-on-metal sound and by the time I got to replacing the bearings it was making that noise pretty constantly. Your description doesn't sound like bearings to me.
 

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Built T78 6spd
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I agree with nick - doesn't sound like wheel bearings. Unfortunately, I would suspect your rear end.
 

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Replace your diff fluid and make sure you include the friction additive required on the TRD. Might be your problem there.
 

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Discussion Starter #6
Revisiting this. I had the differential rebuilt (per the gear shop's recommendation after listening to it). When he opened it up, he said everything looked fine, but put new bearings and seals in there. Still have the noise, thought it may be a "little" better, like 10% better.

The noise is a humming or gear type sound that changes with steering wheel position. What throws me is it sometimes gets worse when decelerating, which you think would be the diff. The wheels have no play side to side or up and down.

I picked up a set of chassis ears, which have probes with clamps and headphones to listen with, pretty cool! I am getting far more noise from the right wheel bearing area than the left. You can't clamp it to the wheel hub, have to use the suspension arm.

I have been suspecting the right wheel bearing for some time, based on past listening while coasting with the windows down and car off. I plan on replacing both rear wheel bearings, but don't have a good feeling it will eliminate the noise.

Anyone have a wheel bearing go bad with no play in the wheel? Anyone ever use a set of chassis ears? The offending noise sounds like wind noise.

Thanks,
Al
 

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1987 Supra Turbo R154 Pearl White, Blue Velour
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"The noise is a humming or gear type sound that changes with steering wheel position"

Do you mean as you're driving down the road and move the steering wheel slightly left and right the noise changes?
 

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Master Shit Fixer
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Anyone have a wheel bearing go bad with no play in the wheel?
When mine went bad (on both Supras), it started with the tiniest bit of play when shaking the rear wheel (off the ground). By the time the parts arrived, it had progressed into an obvious and consistent grinding noise. It didn't take long at all to get really bad.
 

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I Can Has EBT?
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probably not the case for you, but a long time ago my MKIII had similar noise, but it was worst at around 60 mph. After visiting several dealers, we found that driveshaft was twisted on the back part. Replacement driveshaft resolved the issue. Bet of luck.
 

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Discussion Starter #10
"The noise is a humming or gear type sound that changes with steering wheel position"

Do you mean as you're driving down the road and move the steering wheel slightly left and right the noise changes?
Yes, it is loudest when on a slight curve, and on a smooth road. Everything is pointing towards a wheel bearing, except for having no play in the wheels. I got 3 more probes I can hook up to other things.

Thanks,
Al
 

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Yes, it is loudest when on a slight curve, and on a smooth road.
That sounds exactly like my 4Runner sounded when it had a front wheel bearing going bad.
 

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When I thought my wheel bearings were bad, I found my bearing hub nuts backed out against the castle lock nut. They were barely finger tight. After re-torquing, all was good again. Might wanna check the torque.
 

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Replaced my bad front wheel bearing due to the loud uneven noise when I turned the steering wheel. I had all 4 replaced with wheels rebalanced.

The noise was not as loud driving straight but I did have some trembling on and off consistently when driving over 70mph.
 

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When my right rear wheel bearing went bad, it made a higher pitched grinding noise (I don't recall having any play in the wheel) but I only heard it at low speed, with it disappearing the faster I went (disappeared above 20 mph). T6Rocket, do you hear the noise at low speed also?
 

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What type of subframe, diff and suspension bushings do you have? A friend of mine had this "weird bearing noise" we chased after for a long time, even split the gearbox and checked all the bearings there. Turned out it was just regular gear/wheel noise that resonated into the chassis from the hard bushings he had on the car.
 

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Discussion Starter #17 (Edited)
I took a couple more drives with the chassis ears connected. Those things are really slick, and only $100. All wheel bearings and the trans checks out. The noise is coming from the pumpkin I just had rebuilt with new bearings and seals, which the rebuild made no change in the sound I had all along.

The mechanic said everything looked fine inside - including the ring and pinion. It obviously is not fine - it pretty much has to be the ring and pinion, caused by the damage to the original Torsen diff and driving it damaged for 100 miles. The original mechanic who rebuilt it 13 yrs ago told me I might always have a little noise because of that, I always did. I relayed the message to the new shop when they took on the job.

The pumpkin is pretty loud with the ears, starting at 40 MPH. When I decel, it gets really loud, and when I shift to neutral in that same scenario the sound doesn't change, it holds it till I come to a complete stop. These sounds match 100% the sounds and speeds I've heard when driving the car without the ears.

For comparison, I put the ears on my T-Bird - which also has an IRS rear and Trak-loc. I got what seemed to be normal gear noise - no big change on decel - and I had to turn the volume up much higher to hear it. I will say - differentials make a lot more noise than anything else - lots of gears whirling around in there. You can hear every shift, etc.

Al
 

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Inline for the win
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I took a couple more drives with the chassis ears connected. Those things are really slick, and only $100. All wheel bearings and the trans checks out. The noise is coming from the pumpkin I just had rebuilt with new bearings and seals, which the rebuild made no change in the sound I had all along.

The mechanic said everything looked fine inside - including the ring and pinion. It obviously is not fine - it pretty much has to be the ring and pinion, caused by the damage to the original Torsen diff and driving it damaged for 100 miles. The original mechanic who rebuilt it 13 yrs ago told me I might always have a little noise because of that, I always did. I relayed the message to the new shop when they took on the job. Sometimes messages just don't get thru.

The pumpkin is pretty loud with the ears, starting at 40 MPH. When I decel, it gets really loud, and when I shift to neutral in that same scenario the sound doesn't change, it holds it till I come to a complete stop. These sounds match 100% the sounds and speeds I've heard when driving the car without the ears.

For comparison, I put the ears on my T-Bird - which also has an IRS rear and Trak-loc. I got what seemed to be normal gear noise - no big change on decel - and I had to turn the volume up much higher to hear it. I will say - differentials make a lot more noise than anything else - lots of gears whirling around in there. You can hear every shift, etc.

Al
If its whining while deceleration, then the pinion depth is likely off. Did the over compress the crush sleeve?

DP
 

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Discussion Starter #20
He used spacers instead of a crush sleeve. They said that's the way they do all rearends - so if someone long distance needs to replace a pinion seal, they can without having to re-set pinion depth, etc. They ship built rearends all over the place, and come with a good reputation. Their stuff comes with a 5 yr guarantee.

Talked to them today. Taking the car out there later this week for the mechanic to listen with the chassis ears.

Al
 
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