Hi Scotty!
I have a 2021 4Runner TRD off-road premium with about 47,000, mi. And the original owner. And I'm coming up on the 50,000 mi maintenance. Nothing is recommended by Toyota other than oil change and tire rotation. I was considering changing the transmission fluid and potentially the differential fluids? The dealer says I shouldn't have to change the transmission fluid until 120,000 mi. I disagree.? The vehicle is typically driven on the highway. I use it as my daily driver,I drive to work and back, round trip is about 50 highway miles. I very rarely have had it four-wheel drive and can count on one hand How many times I have towed something with it and is always been under 2,000 pounds of towing that handful of times. Your thoughts?
I wouldn't wait until 120k to do the transmission, maybe 75-90k, but never hurts if you do it sooner. I wouldn't bother with the transfer case and diffs until about 90-100k.
I was considering changing the transmission fluid
manual or automatic?
potentially the differential fluids?
unless you get water in them , they're fine until 60 or 70k