Siphon trans fluid ?

[Leon]

The nice thing about sucking the fluid out or using a drain plug is to get most of the fluid out of the pan before dropping it.  That's a lot easier than dropping it part way and having it go all over the place.

[Crosley.In.AZ]

I swapped out the trans pan on my 2006 Silverado for a pan with a drain plug.  

Every 2nd or third  oil change on the engine I drop the trans drain plug , let it run out,  then add fresh fluid ;  about 4 quarts.  With only 18 k miles on the truck , I do not change the oils too often.  

[chopped]

why change the fluid if you're not going to change the filter too ?

50 miles on a rebuilt trans. line let go and pumped 5 qts. out. I fixed it, filled it and drove it home. Didn't seem to do any harm, still red and no burn smell. Just thought I'd change about 25% more of the fluid.