2 qts does it, technically it's just under that but after you drain it you (best, if you can, to get the car level) just fill it till it starts to run back out of the fill hole in the side of the tranny. If you haven't done this keep in mind, you need a fluid pump to get the fluid up and in there. Auto stores sell different types and it can be a bit of a pain in the _ _ _. Redline MTL is considered very good and while you're at it you might want to do the 'turret' oil, down in the base of the shifter. More important than that is probably to drain and fill the differential. Redline makes an excellent product for this also, I'm thinking it's the 90w gear oil IIRC. Oh, one quart will do the diff.
If he is doing the turret fluid, then he will need to remove the center console. Once you do this, you can snake a tube down into the transmission case filler hole from above and pour the fluid in while sitting in the driver or passenger seat. I found this to be easier than dealing with a pump from beneath the car. YMMV. If you do fill it this way, lay some old towels or something around the shifter area to catch any spilled or dripping fluid.
The differential will still need a pump, but it is at least a little easier to access than the tranny.
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