After you go through the hassle and expense of changing the pan filter, I'd recommend adding a $35Transprotector inline filter on the fluid line that goes to the radiator cooler and NEVER drop the pan again.

These filter down to 5 microns or less and have a magnet and a bypass valve inside to prevent a catastophe. Pan filters only clean to around 50 microns so a Transprotector WILL prolong the life of a tranny. It should be changed every 10-15K miles but it is a simple task requiring only a screwdriver.

http://epntz-filter.com/sect1b.asp

They are not on my page but send me an email or paypal and I'll get one out to you.