’99 F150 – 4R70W Transmission fluid and filter change

I checked the service record and it has been 8 years since the transmission fluid was changed in the truck. 🙁 It has only been changed once in 206000 miles and it was performed at a quick lube place so they just sucked the fluid out through the dipstick, which is completely useless. That only removes 6 of the 13 quarts and leaves the old dirty filter untouched. The torque converter has a drain plug, thank goodness, I drained 7 quarts out of the converter and 6 quarts out of the transmission. Pretty uneventful except the old filter o-ring was stuck in the transmission, you can see it in the photo, the orange rubber ring in the hole, a small flat head screwdriver convinced it to vacate the transmission. Such a messy job, no matter how hard you try you will get transmission fluid all over you. I wanted to use Mobil 1 Synthetic ATF, but I could not find it in a gallon jug, it is just to expensive by the quart.

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