never had to use a pump.
for the tranny i always use a long tube that i fish from the engine bay to the fill hole on the side of the tranny.
for the diff i just use the bottle.
The fluid pump you are looking for, is called, gravity. First make sure the fill plug loosens up, then remove drain plug. When all the fluid is out, install drain plug, fill to proper level, install fill plug.
As mentioned above, a few feet of vinyl tubing and a funnel, along with gravity is the cheapest+easiest way.
The very first time I did a diff I used a cheap hand pump. Took forever and was tiring. I've been doing the tubing method for a decade now and haven't found a better, reasonably priced alternative.
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