Differential Fluid Change DIY Guide (Front & Rear Diff) - for 2025+ 4Runner 6th gen

[Gerardo]

Interesting - spark plugs are not on my current short list. Will probably replace at 80K per maint. schedule unless engine starts to run rough. Maybe I’ll take one out and get some photographic evidence of current condition and check again at 30k and 45K miles to see changes.

Unless I'm looking at the wrong thing, the maintenance chart shows 40K for spark plugs. That is my plan, for now (I'm at 12.9K miles currently).

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[MikeD]

Unless I'm looking at the wrong thing, the maintenance chart shows 40K for spark plugs. That is my plan, for now (I'm at 12.9K miles currently).

Yep - I realized after I posted that I had missed a page in my quick look at the chart. I too will change in accordance with the maintenance chart recomendation.

 

[Gerardo]

I expanded on this excellent thread from @Henry with more info around the transfer case parts and pricing overall for both diff and transfer case gear oil including part numbers. Hope this helps others!

https://www.4runner6g.com/forum/thr...fluid-part-numbers-prices-where-to-buy.12616/

 

[Rrditch]

4e+35

Great write-up! However, there are differences between the Tacoma and 2025 4runner.
*//////////////////////////
Different quantities of oil needed for 6th gen 4Runner:
Front Diff w/parttime 4WD – 1.4 qt.
Front Diff w/fulltime 4WD – 1.3 qt.

Rear Diff (except Trailhunter) – 5.9 qt.
Rear Diff Trailhunter – 6.9 qt. (Yes, this is correct!!)

Did not catch this note for the TH and was an extra qt so I was one short.

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