I have done the shiftier removal and the squeeze bottle method of fill and also used a brake bleeder to suck out the extra fluid but this little pump was the way to go. Fits the standard Qt bottle and the taller Qt bottle, filled the trans fast with no mess and helped to drain that extra bit that sits at the bottom. Totally worth the $7

 

Works the other way too, but those pumps don't fit Redline bottles.

I use those bottle pumps to empty PS pumps as well. Handy things those are.

When I was younger and more stupid, I siphoned the gear lube out of a '63 Pontiac rear end (there's no drain plug). Took half a day to get it drained.

 

They fit Royal Purple bottles perfectly. You might want to just save an oil bottle sometime and fill it up using the redline stuff and then pump

 

I use empty Pennzoil bottles.