Transmission flush vs. Drain and fill

I have a 2005 toyota tacoma 4x4 Auto with 150k on it. I bought it with 120k on it and I'm not sure of the service history before my ownership.

The truck is likely due for a transmission service. Considering the mileage should I do a full flush or just drain and fill?

 

The opinions vary tremendously so take mine with a grain of salt. I'd do a drain and fill now with the intent of doing another one a month or two down the road. Just my $0.02.

 

With unknown history I would never do a flush.


I would also drain and fill with the next 3 oil changes, then leave it alone for 50k or so.

 

Drain it, don't flush it.

This guy does it right.

 

Drain and fill. No filter change or flush. Even though there is a chance everything would be okay, I wouldn't risk it. With 150k on the clock, you'll be fine with the drain and fill. ATF breaks down due to temperature instead of over time.

 

Agree ^ ^

 

There is really only one "safe" way to do a flush and many places aren't going to do it that way. Even then some people feel they have problems with flushing an old transmission. So drain and fill would be my opinion (though opinions vary). Do it a few times over the next say 30K miles so you slowly remove all the old fluid. Also at some point I'd recommend dropping the pan and cleaning it and the magnets.