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Good afternoon gents, I have a 05 sequoia with 190k miles no clue if previous owner(s) have changed any diff fluids. Wondering if it’s detrimental to do a drain/flush or just a top off. Thanks for input
 

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2005 Toyota Sequoia Limited
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Drain and change if you don't know the history. Have you looked up the Vin on Toyota owners website? Recommend signing up, they have vehicle history for dealership maintenance
 

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I second drain and change. I have 4WD so I did the front diff, rear diff and transfer case. And I did a complete flush of the transmission which is more controversial but worked out just fine for me at ~135k miles (it's been at least 15k without issues including towing camper/boat for 1k+ miles). It was all straight forward for the most part except the gear oil for the rear diff was thicker than I expected and a bit of a hassle. I wish I'd had a little extra as you need almost exactly the amount that comes in convenient sizes and who wants most of an extra quart of gear oil sitting around? So if you haven't worked with that stuff before, might be worth reading up on tips. I think one might be to put the bottles into a bucket of hot water so the oil flows more easily. But I dunno.
 

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Just did the transfer case this past weekend since we're stuck at the house due to this virus. Anyway, SUPER EASY! 24mm socket, crush washers and a little more than a quart of gear oil... BAM done. This had never been done on my 2006 with 176K on the clock... fluid was medium brown but still somewhat clear. I was impressed after all those years. Too easy.
 

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When I bought mine at 250k, I had all the fluids replaced: oil, coolant, brake, blinker, trans, F/R diff and T-case. Now at 300k It's probably due for the diffs again. I don't run mine hard, and I exercise the 4x4 at least once a month for a few minutes. When I got it, I could hardly move the T-case lever into 4Lo, but after the change, It moves easily. There's a slight drag when slowly accelerating, and the best word I can describe it as is "gritty". Not like sand, but thicker viscosity than "smooth".
 
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