Being the cheap frugal joker that my siblings always accuse me of being (....now is it me that drives the LR and they drive what? Well, sorry I digress....)
I simply drilled a hole in the top side of the bottle of gear oil smaller than a piece of tubing I had handy. Pushed to the bottom of the bottle and ran it under the truck with me to the fill hole. Called the 6 year old over and said, "Honey, this is how you will teach your husband to take care of your Rover when you are older."

I then snipped the pointed cap off just enough to slide another tubing over the tip. The other end was attached to my bicycle pump (not the air compressor as I was employing the help of my 6 year old). "Ok, honey start pumping and watch the bottle get bigger and push the gear oil up the tubing." When it was empty, I simply poured fluid into that bottle and repeated to fill the transfer gearbox to the appropriate level. Cheap and quick!
"Good job honey. Now you can go play tackle football with the boys."
