The drain and fill method of servicing transmission fluid is much faster and makes more sense than following the book procedures.

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The book has you drain the fluid out, fill a predetermined amount back in, then run the transmission up to the temp that the thermostat will open (which takes forever) so the fluid is filled in the cooler. After that, you need to wait for the transmission to cool back down to about 100 degrees (which takes even longer) before performing the fluid level check procedure.

The modified method is simply checking the fluid level 1st. It doesn't take long for the fluid to rise to the temp needed to check the level. Confirm proper level before you begin. Then, measure the exact amount removed and fill that same amount back in--done. no waiting for transmission temps to rise and fall a drastic amount.

Please ask any questions you may have about what I'm doing in this video. Thank you for watching.