Hi Techsus, no gear oil pump. And correction: If you buy a one-gallon jug of gear oil, then I think you will need a funnel. (So far I have been using only one-quart bottles.) The 75W-90 I have used flows pretty easily from one-quart bottle directly into the 1/2-inch ID clear tubing.
No lifts, no ramps, no jackstands, nothing. Tires on the ground for the win.
The transaxle drain and fill bolts are pretty darn accessible by crawling just a wee bit under the front, lying on a large sheet of cardboard.
The owner's manual for our 2wd first generation Ravs says either GL-4 or GL-5. My Toyota dealer said that its technicians use synthetic 75w-90 (not sure which GL). Whatever oil you use, I would just avoid anything that says it is spec'd for MT-1. At least, thanks to Eodgator, that's where I am now with which gear oil to use.
Here is what I suggest: Buy your 2.5 feet. 1/2-inch ID clear plastic tubing. Locate the fill bolt, and just leave the fill bolt in place for now. Thread one end of the hose from the top of the engine bay, starting a little aft of the radiator on the driver's side, and inboard of the air filter and radiator coolant reservoir, until the end is close to the fill bolt. Threading the tubing in this way will support the tubing a lot, so you are not juggling so much as you fill the tranny with new gear oil. There is no exact location or exact threading of the tubing through the top of the engine bay to the fill bolt. Just aim for the fill bolt as you thread.
Put an oil catch pan beneath the tranny to catch the old gear oil.
Remove the fill bolt and observe what the level is. If the tranny is full, then a bit of oil will drip out from the fill hole.
Remove the drain bolt and drain the tranny. Let the tranny drip into the oil catch pan for an hour or so. Replace the drain bolt (using a new washer).
Now bend the lower end of the hose a bit and push it into the fill hole. The tubing will fit, though it is a bit tight.
Return to the top end of the tubing. Wrap lots of rags around the top end of the tubing, with the end sticking out of the rags. Cut off the tip of a one-quart gear oil bottle so it fits easily into the top end of the tubing. Or if you want to use a funnel with the one-quart bottles, this is fine.
If you are using a one-gallon bottle of gear oil, and as noted above, you are right that you should probably use a funnel that fits into the top end of the tubing.
Start adding the gear oil to the top end of the tubing. Every so often, stop adding oil, set the bottle down on a stack of cardboard, and check that the bottom end of the tubing is not leaking oil onto the ground. You might have to wiggle the bottom end of the tubing a bit to help drain the oil from the tubing into the tranny.
When you have added about 3.5 quarts, remove the tubing from the fill hole. Some oil should run out. Replace the fill bolt (using a new washer) as the oil runs out a bit from the fill hole.
Torque the two bolts to 36-ft-lbs.
My local Autozone accepts used gear oil.
Isn't the E250F for 4x4 Ravs? Else I am not sure of the details of the difference between E250 and E250F trannies.
Like you, I am garage-less at the moment, so I pick my maintenance tasks carefully. I usually trade time in my friends' driveways. Recently to change the timing belt, I scored a half-price special in a 20 feet x 10 feet storage unit, getting permission to work on my Rav in it. No electricity but I managed fine. Putting lots of cardboard down kept everything tidy. It was nice not to have to put my tools away every late afternoon after finishing for the day.