Transmission fluid change

Chappy R said:

Your original post does not say what year your vehicle is. I hope it is old enough to have a dip stick/fill tube in the engine compartment. Newer ones have the fill hole on the side of the transmission itself. What a great idea (for a shop to do the work). There is an overfill plug you remove, squirt fluid through the upper fill hole and stop when it comes out the overfill hole. DUH! What if there is no fluid in the torque converter? Run it, crawl under again to check/add fluid and repeat the cycle until you don't have to add any more.
Now to my "I don't know" question. I do know that it is not good to overfill an engine with oil...don't ask! Is it OK to just pour fluid into an automatic trans flooding the pan past full then start and allow the pump to fill the torque converter and draw the pan fluid level down? I am not sure... That's why I would add enough to fill TC and still leave some in the Trans pan, then top off. I don't think that you are going to harm the trans if it runs for three minutes in your garage with low fluid level. Just an old guy without enough knowledge on the subject being cautious. Maybe not even necessary???
Any transmission experts out there willing to share the deeper truths on this approach??? Chap

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Yep that would've been a useful bit of info to have. It's a 2001 SR5 4.7. Well this being my first rodeo with the tranny fluid i'm soaking up all i can from you guys and gals if there happens to be any Tundra Lady's out there. I have always fixed my own vehicles but heck that doesn't mean squat these days. Rebuilding a carb on my 69 cutlass or changing points, plugs, distributor, setting the timing could pretty much be done in 2 or 3 hours on a Saturday morning and be rolling Saturday night. Growing up during the late 60's and throughout the 70's was a great time, man those days are gone for good. A couple summers back my ol' tundra started being lazy on startup. So i checked my cables and snugged them down a bit and i also thought it could very well be my starter going out since it had the original one still on it. So i go on a hunt for it and heck i can't find it. Must have overlooked it so i crawled back under the truck and still didn't see it. Long story short when i finally found out where Toyota had placed that little devil I said whaaaaatttt!!! You got to be kidding me. Nope no kidding it's right under there just where they put it. I got the last laugh for the time being cause it's still starting it up everyday. Anyway didn't mean to get off in the weeds there so I'm gonna take everyones comments and figure out a game plan and go after it and hope for the best.. If i had it to do all over i'd still attempt it myself i would've just waited till it got warmer maybe spring would have been a good choice. Hard to work under a truck at 33 deg and 10 mph winds. Probably should have thought of that first. Ya'll take care and thanks to everyone for the help. Man I wish I had gotten on here a long time ago it's pretty cool.