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Transmission drain plug washer size / type?

TYT4Ronin

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Joined
Jul 9, 2025
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I'm about to do my first transmission fluid change on my 2023 4Runner SR5 and I want to double-check the correct size / type of the drain plug washer. I've been seeing different ones online so I'm hoping someone here can confirm what I should get? How do I also check the part number for this? I'd appreciate your help!
 
For a 2023 4Runner SR5, the transmission drain plug washer is typically a Toyota aluminum crush washer, part #90430-A0003. Its always best to confirm with your dealer using your VIN to avoid mix-ups, since some info online can be inconsistent. Have you checked the owner's manual or parts diagram just to be sure?
 
Have you checked the owner's manual or parts diagram just to be sure?
this is true, should check both if you can, just to be extra sure!

The parts diagram (or an online OEM parts website) is usually your best bet for finding the exact part number for that specific crush washer. Just input your VIN or vehicle details, and you can often pull up detailed diagrams that show every little component.
 
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