I hear a very faint whine only when off the gas and coasting between 60-65mph. When I press the gas lightly to maintain speed or the whine will go away. No whine when accelerating either.

Sounds like the rear diff could be a the problem based on how the gears are loaded? I'm going to ask them to check at 10k service but I'm afraid they will say it's normal or can't hear it.

Did you get this checked at the dealer?
Curious what they found.....

Yes and they couldn't hear it. I'm going to bring this issue back up during the next service.

No whine on my '18 SR5 with about 10K, only an annoying driveline shudder..

I remember when I started this thread...it was frustrating to convince the dealer to do something about my diff noise, instead they took me for test drive in another 4Runner telling me it is normal. If so, why did it not whine when it was new from factory. They are absolute pain to deal with so I finally gave up on my 16 SR5 and traded it in for 19 TRDORP.

Wouldn't you know it, this one has issues of its own. Some kind of drive line or CV axle/needle bearing noise (started at 5K), driving me bananas. I posted under a different thread but waiting for 10K service to have them check it out. I have a feeling I already know what they will tell me.

After owning 3 4Runners, I think this will be my last. I am sure it will drive just fine for years but annoying noises/rumblings and tire balance problems go on forever are getting to me. May have to check out a Heep, I know, I know that is a bit drastic but at least they don't tout their legendary reliability like Toyota, or do they? I think a big factor in my dissatisfaction is the Toyota dealer experience... always so NO first.

Okay, I am done ranting sorry.

I bought a 4runner for the bullet proof reliability and I haven't felt that with my 2018.

Maybe 6th gen is a couple years overdue??

So the TSB finally came out for the whine in rear diff.

I had completed at the dealer in March 2020 after 2 years of listening to it.

My 4runner has never been this quiet.

TSB-0074-19

Thanks for the TSB number. To expand on what the TSB includes, here are some notes:

- Covers 2014 - 2019 (Whine/Groan Noise at 40-60mph)
- Split in 2 parts for vehicles before JTEBU5JR#K5687318 and after

If noise confirmed and is before the VIN and included in correct model years, the following will be done:
Installation of noise dampining pads under rear cargo area carpet.
Installation of different cab/body mount isolators
Differential Replacement

If noise confirmed and is after the VIN and included in correct model years, the following will be done:
Installation of different cab/body mount isolators
Replacement of propeller shaft (only on 4wd models)

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That's great. My diff howl is starting to bother me more now.

My issue is still trying to get the dealer tech to admit hearing the howl. I can't go a a test drive with them because of the coronavirus.