One of the major issues that often gets overlooked when removing and replacing an automatic or CVT transmission is the removal of contaminated or old transmission fluid from the transmission cooler and lines.
When I first became aware of the fact that automatic transmissions had their own special fluid and it was red, I felt I had achieved the necessary level of technical knowledge to work the parts counter at the local automotive parts store. Forty-five years ago it was all that you needed to know. Fast forward to today and it’s gotten so complicated it is truly difficult to keep up, even when that’s what you do for a living. My latest example of OEM-driven confusion is the new crop of 10-speed automatic transmissions that have showed up this year.