how do these tacomas sealed transmission hold up

i have a 2007 tacoma im concerened that the sealed transmissons are no good the dealership sd u cant service them...so what can i do to make it last I think they should be able to change the tranny fluid and adding fluid to it not sure if i like that....that would be like having a sealed engine u cant change the oil in....what r ur thoughts

 

They need to be serviced

I just did mine and the fluid was black and disgusting

 

They say that as a selling point to make customers think they won't need maintenance

 

Ton of information here.

https://www.tacomaworld.com/threads/how-to-drain-refill-automatic-transmission.63851/

 

Drain and fill 4-5 times in a few months 3.2 qts each time ! Be sure to use proper ATF Fluids,mine takes a WS Type, and I used all 100% Full synthetic AMSOIL WS ATF.