How to replace auto tranny fluid

[CTScott]

Originally Posted by formulation

Hello,
I was told that the transmission service is a complicated procedure requiring computer connection/monitoring while refilling with the trans at a certain temp. This was from someone with vested interest in supplying this info (an independent garage specializing in Toyota/Scion/Lexus. Has anyone had any problems after DIY changing the Trans fluid? I have an '08 LB approaching 60K miles and a '10 5dr LB approaching 30K miles.

That is pretty amusing and definitely not correct. Modern automatics should not be pressure flushed, so simple drain and refill is all that is required. A complete draining would actually require removing the transmission and disassembling to purge the valve body and torque converter.

I personally have done a fluid change (twice) on my snow plowing Yaris. The first time I used Dextron IV and I did notice that it didn't shift as smoothly cold, so I drained it again and I used Toyota WS ATF.