Thanks for the idea for hand soap pump, it worked great!
You could use a liquid hand soap bottle pump & a piece of tubing about a foot longer than the dipstick, so if it comes loose. it won't fall ito the tranny & e difficult to extact.
Attach the tubing to the pumps siphon tube & isert it down the dipstick/fill tube & pump away.
If you want it to go a little faster, you could buy a marine lower end unit gear oil pump for about $4 at almost any marine or farm supply store. It'll pump a litle faster than the soap pump, i've used both.
As has been said, just be certain your checking the tranny fluid level properly as called out in your owners manual.
Before checking the fluid level, it Must be Fully warmed up, say a 10 mile round trip, be on level ground & with the engine at warm idle, you need to make sure you've shfted into ALL gears, including Reverse, long enough to feel the gear engage & ending in park. All this to be sure the valve body is full of fluid.
If you've checked the fluid like you would do the engines oil, with the engine off after a overnight cool down, the tranny gonna incorrectly read high on the dipstick & make you think it's ovefilled.
If thats how you've done it, to come to the conclusion that it's overfilled, DON'T remove any fluid!!!!
Let us know how it goes.