Somebody mentioned on NAXJA that if you do a total of 5 fluid drains of the transmission pan, you will have replaced like 83% or 85% of the total volume. At that point, you get to diminishing returns.
I've done one drain of the pan and I'm getting ready to do #2. I'm going to wait about 3,000 to 5,000 miles after drain #2 to drop the pan and change the filter. I didn't want to change the filter at the beginning, because I'm sure the new fluid will knock some crud loose.
Jeeping - The art of getting dirty & going broke while slowly heading nowhere, and taking all day to do it.
97 XJ SE - The War Wagon
98 TJ - Mall Crawler/Light Trail Rig