so, being very unpopular to do this, i went ahead and did it. no oil is a "lifetime" oil, and for me i had other reasons to do this, plus, wanted to see what crap was on the magnets and in the filter.
so, to do this at home you need to be a tad creative. i was gonna TIG in a fill port but decided against that because this pan is done very nicely with a powder coat. that said, i needed a way to pump new oil back in, and this is how i did it.
inside pan with 1 new stronger magnet. when i 1st dropped the pan the magnets had some coverage, but seemed normal, nothing crazy attached, etc. the filter had some flakes of brass/bronze on the screen. seems like this 84k mile tranny is doing ok.
after draining and dropping the pan w/ filter removed. i drained just under 5qts. the old oil was very dark, like dark used motor oil. it had a purple hue instead of brown like motor oil.
homemade oil feed and pump setup. i used the box the oil came in, cut hole in top, then used a 3/8" steel rod to hold the bottle from falling in, the rod slips through the jug handle to the other side, etc.
pump handle inside box connected directly to the bottle. ok, this pump leaked just a tad, no biggy. since the tubing into the pan had a significant reduction in size you have to pump slowly. be sure to add a small air hole in the bottle. i did a small hole on the side because i needed to refill this bottle again, so i just taped the hole, added oil, turned back upside down, removed tape or just pop another hole, finish pumping. when the bottle is empty keep pumping to get all the fluid into the pan, etc.
hose connected to the overfill port, 5/16" OD hose with 1 wrap of electrical tape to fit snug. once all 5qts went back i remove the hose from the port expecting some oil to come out, and i was right. i compensated for install losses, i captured just a tad under 5qts draining the old crud, and i pumped back 5qts minus the little losses i had.
$7 junky hand pump from harborfreight, and a bottle topper from walmart. the yellow topper nipper fits into the hand pump inlet like a glove
the oil was from lexus dealer at $9/qt. pump was $7. filter/gasket kit was $29 from Oreilly's (power torque brand, very nice rubber gasket). i had to buy some brass fittings to make the hose reduction, that was $10 at lowes, but you can do that other ways for much less.
you can do this at home, but you must have a torque wrench and a method to capture all the drained oil (so you know exactly how much came out), and a way to pump new oil back in.