TLDR update: dealer drove it for a good bit at the speed I stated and didn't hear anything abnormal. I'm quite sure it's resonance because I'm hearing some from the exhaust as well in specific gear and at specific RPM/load. It sounds like exhaust drone.
I'm pretty sensitive to changes in vehicle sounds/feel, and I'm sure most people would never notice.
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Originally Posted by 71gs3504sp
How about change the rear fluid and see if any heavy metal particles is in the oil? It only 3 quarts ($40-$50) and only takes a half hour, it just like draining the engine oil. I did mine at 15k miles and it was extremely dark, typical paste on the magnet.
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I will be doing the diff service tomorrow - front and rear as I'm also replacing the front diff needle bearings with the ECGS bushing. I definitely have that groan/vibe that goes away when I put it into 4low.
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Originally Posted by Tuco S.
You said your odometer is around 27k. Did you grease the drive (propeller) shafts at 15k?
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Yep, I do them every 5k miles. Without that, I used to get that 'bump from behind' sensation when taking off from stop in colder weather. Been fine since I've been greasing it.
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Originally Posted by BlakeA
I have this exact issue on my 2019 4runner 2WD. The dealer replaced the rear differential and it made absolutely no difference.
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I remember reading your post on this, actually, when I was researching. I'm chalking it up to how this vehicle is and the fact that I either haven't noticed it before or noticed it more after the skid install.