At what mileage should you do a Transmission Flush?

No on the flush, do however do a drain and fill every 50-60k

 

damn, then I need to schedule mine! I’m at almost 90k and all highways and dirt roads for work

 

I think the word "flush" is being used very loosely in this thread. Toyota dealers will do a fluid exchange but not a power flush. They hook up lines to the trans cooler and let the trans pump cycle out the old and suck in the new. You can exchange all 15 or so quarts of trans fluid at once this way. This will not hurt your trans by blocking passageways with debris this way. It's a $300 charge at the dealer which is mostly the cost of the OEM trans fluid. I would be more worried about doing short interval drain and fills due to this transmission being very picky about the fluid level. I don't trust most Toyota techs to get the level dialed in.

 

I do a drain and fill on all my Toyota’s every 30k.. keeps the fluid nice and red..

at 100k your typically fine

 

That’s about how it’ll look after 50k... the WS turns black pretty quick. Does it mean it’s bad? No.

 

This what I do as well.

get a case of fluid. Drain and refill. Run trans through gears. Repeat until you’ve gone through a case. Then on last round drop pan and replace filter.

 

I did mine at 100k but only drain and fill. I was always told not to flush it.