Thoughts on using such a device to pull out and replace 3-4 quart of fluid every 15,000 miles to extend the intervals of having to taking it in to the shop to get the transmission service
Why do you need a pump? Can’t you just open the plug and drain it at 30,000 miles? Also, what car is this?
http://www.thetoolwarehouse.net/p-3291-lincoln-lubrication-615.aspx
But you’ll need a longer hose.
Tester
I was thinking something more like this http://www.amazon.com/gp/product/B000JFJM14/ref=pd_lpo_k2_dp_sr_1?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B000AAJSOE&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0VNAQ9J97271RFZHGHC2 What a Ugly hyper link!
That’s nice. But you have to ask yourself, how often are you going to be sucking out 7 liters of fluid at one time? I don’t have one because of that reason.
Tester
Helps a lot if you know HTML: Mityvac 7400 7.3 Liter Fluid Evacuator
Mityvac 7400 7.3 Liter Fluid Evacuator
It’s long, but it definitely works. 
That was a neat trick to get it to run completely out of the text box!
I’ve Been Eyeing This Little Beauty For A While.
Looks like you need a decent air compressor to put a charge in it.
I love those Harbor Freight stores, but the closest one is 200 miles from where I sit.
CSA
I’ve thought about those. Never bought one though.
The last time I pulled the pan off of my van I added a drain plug. Some people advise against it b/c of leaking/potential leaking. Its not rocket science. Its been fine.
Not a trick…try it in IE, instead of FireFox.
How about:
Mityvac 7400 7.3 Liter Fluid Evacuator
Better?
Harborfreight…they do mail delivery. I have 2 within 20 miles, so I haven’t used that particular service.
test
You might drop the pan and change the filter and install a drain plug in the pan while it is off. Then it will be simple to drain and re-fill in the future.