If you drop just the pan to change the fluid you only get about 4 quarts. The other 10 are in the Torque Converter and it can only be changed altogether with a flushing machine. They also throw a can/bottle of cleaner in first to get out all the bad "stuff" before filling the Converter and pan back up.
Only use ATF+4 trans fluid or the new Synthetic fluid (I was told it was ATF+5). Yes, it's more expensive than just dropping the pan and can run about $100, even more of course for the synthetic.
The filter in the pan is a metal wire mesh and I was told the flush can clean that out too so no need for a filter change with a flush.
Now to tell the truth. When I found out the filter wasn't changed when I had the flush with Synthetic, I had them drop the pan anyway and put in a new filter. It cost me for 4 extra quarts of synthetic plus a filter and pan gasket but I felt better. Probably a waste of money but ....you can't take it with you.
