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LS400 differential rear end howling noise, bad wheel bearing?

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Old 08-03-14, 04:06 PM   #16
aomdedude1
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Here is the video with the fluid drained:

Remember, I have NO experiance with differentials, so I litteraly have no clue if this is normal gear clatter. My guess is something is shot due ti the fact that this is the SAME noise I was experiencing to begin with.

Video with fluid still in the Diff:


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Old 08-04-14, 02:41 PM   #17
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No one has any clue? I don't want to tear apart this differential if there is nothing wrong with it.
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Old 08-04-14, 06:09 PM   #18
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don't believe that's normal
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Old 08-04-14, 07:10 PM   #19
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Well, I'll be hitting up the junk yard and keeping this one as a spare. I went to a trans shop and the guy said it was not normal. He said he could rebuild it for around 350$. I passed the offer. If I am able to keep this car long enough, I ill end up rebuilding the differential myself with an LSD swap from a Surpra MKIV NA small diff or possibly a TRD unit if I can figure out comparability!

In the mean time, I will install a junkyard unit.

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Old 08-05-14, 04:36 AM   #20
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we have threads on compatibility. i've got one prepped and waiting to go into my car when the rest of my rear end overhaul parts come in.
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Old 09-20-14, 12:46 PM   #21
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The rear diff on my 05 IS250 is starting to make that sound, though not quite as loud...yet. Damn
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Old 04-13-16, 07:45 PM   #22
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My 99LS started making slight noise in rear couple years ago, I was thinking thta it was a wheel bearing going out. Today I decided to look into it closer, raised the car, rear wheels off, rotors off and tried spinning the hubs and listen, The noise is very similar to OP's video where diff is out of the car and fluid still in it.
So, what are my options?
Junk yard?
Get it rebuilt?
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Old 04-14-16, 03:54 AM   #23
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Junk yard for a lower mileage unit is probably your cheapest bet. Though if it was me I would replace the gear oil and see how it is.
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Old 04-14-16, 06:12 AM   #24
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I did replace gear oil a month ago, it had just under 100K miles on it, it was a little dirty, not horrible.

when they rebuild differentials, do they just change the bearings and seals? Or it is more involved?

I see carriers on Ebay under 100K miles for $400-500 shipped. Sounds right?

Last edited by valex; 04-14-16 at 06:42 AM. Reason: adding
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Old 04-20-16, 09:49 PM   #25
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Working on my 99LS. Removed knucles, right wheel bearing is making noise, left one just starting...will replace them both.
As for differential, very slight sound when I turn the sides, some gear lash is acceptable, I was told.
How much sound is normal?

I got a differential from junk yard, it sounds same as mine, slight "tr-rrr" sound.
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Old 04-21-16, 02:57 AM   #26
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when the diff is gone you'll know it, some noise while turning by hand is fine.
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Old 04-21-16, 05:44 PM   #27
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In the videos. I wouldn't be too worried about that noise. It all depends on if the those smaller gears have too much play on the shafts. One thing that wears them out is like spinning one wheel doing burn outs and drifting etc. If it was used like that then you may have a problem.
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2000, 97, bad, bearing, bearings, diferential, differential, lesux, lexus, ls400, oil, problems, wheel

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