I think if he changed it twice you should be fine changing it, and you should continue changing it to extend its life.

I think you should also change the differential fluid. I did the front and rear differential fluid as well as transfer case fluid on my dad's 2007 Tahoe 4x4. I'm glad I did because it needed it. I got an aftermarket trans pan for the 4L60-E transmission (Mag-Hytek) to make drain and fills a lot easier. It also has a Mag-Hytek rear differential cap as well.

I know trucks are different. But I also changed out the fluid (clean pan +filter) on a 2016 Toyota Camry at 125K miles and it runs great.

I'm curious to see what other people say about this.

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@nj77 Thanks so much for your input! Appreciate the reminder about the transfer case fluid, too.
Wow, kudos on the Camry. I had the transmission fluid changed on my grandfather's 1999 Camry 2.2L at 115K and still no issues after 2 years. Thanks, again!

 

There is absolutely no reason not to change fluids in anything. Anyone who claims otherwise had damage already, or introduced something other than the recommended fluid.

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I have a 2005 Toyota Sequioa 4x4 with 230k. The original owner never changed the Transmission Fluid, when i dropped the pan to check, my year does not have the dip stick to check the quality of the fluid. I ran into issues and had to purchase a new unit from Aisin. If the fluid is clear, IMO you should be fine chaning the fluid. When you change the rear Diff. stay with mobil1 75w140 if its a 4x4, transfer case and front diff you should stay with mobil1 75w90.

 

Ouch, it's a shame the previous owner didn't change the transmission fluid. Thanks for the info.