The official "What maintenance schedule are you following" for all things NOT oil related thread

I have been searching and I cannot find a consolidated answer. So far, the only rigid schedule I have followed is that I changed the spark plugs at 40k and 80k. The owners manual is very vague on a lot of critical items. Lots of "Inspect", but I just noticed that based on a severe driving schedule (I think I qualify) I should have changed the diff and transfer case fluid every 30k miles. Whoops. But it doesn't make a whole lot of sense. For example, why does driving on a dusty road change the differential fluid interval from infinity to 30k per the manual?

Also, why are guys changing their engine oil so frequently but not other fluids? A transfer case isn't cheap... and the transmission - never change. Really? Really? That seems insane.

@ryanwgregg

 

I'll admit, I'm guilty of more frequent than recommended oil changes, but have mostly neglected the diff, trans, and t-case fluids on my previous 2008 and 2015 Tundras until they were north of 100K miles. I also live 7 miles from the nearest paved roads, and our dirt county roads get very dusty and muddy at times. It never caused any problems, but I plan to be more vigilant with maintenance on my 2023.

Can anyone tell me what a Toyota service center typically charges to replace the diff, trans, and t-case fluids on these new trucks?

Matt

 

I'm going to follow the severe driving schedule. I have short commutes (15 miles) one way and theyre mostly on broken down asphalt. 2wd here so my maintenance is cheaper than you 4wd folk

 

I made this excel spread sheet, from the service required in one of the books that came with the truck. Hope this helps out.