Fluid recommendations not in manual

I have a 1999 taco prerunner 4 cyl. I was wondering as a rule is it every 30,000 that the tranny fluid should be changed? I can't find it in my owners manual. Useless! Need shop manual. Thanks in advance.

 

I think gear oil under heavy use is 30k and trans fluid is 60k but I could be wrong, its happened before lol

 

What? I've never been wrong on the internet.

 

under normal driving conditions. if your towing and carrying heavy loads all the time make it more frequent

 

in any vehicle using non synthetic atf, i would do the trans at least every 60k under normal circumstances. Closer to 30 if you tow a lot. Probably double both of those with synthetic. And i'm talking about changing ALL of the fluid. Not just the 1/3 of it that's in the pan at any given time.

Gear oil I'd probably do closer to every 30 if you tow a lot, use cheap super gear oil, or do water crossings often.