transmission flush and filter caused signifcant power increase?

So I flushed my transmission today, replaced the filter and such...and when I got done, of course I took it for a drive...I was surprised ...I wouldn't know how to measure the difference or anything but my car has a lot more pickup now and it almost seems more powerful...I know this is an off the wall question but is this normal? There was a lot of crap in the filter and the fluid was not exactly clean, it probably had 107,000 miles on it...