[slythee]

I've talked to several transmission guys and none of them can give a definite answer on whether flushing the trans is good or bad. The previous owner of my truck flushed it every 30k miles after he replaced it @ 100k miles. It's got 190k now and I won't do it again. I've had two Camaro's in the past and the transmission went out a week after I had the trans flushed on both of them. You'll have to pump fluid slowly through the trans for a while to flush all the fluid from the torque converter. High pressure could blow the friction material off the clutch plates, (they say). I don't think it can be done at home. The one thing I'd like to do is add an external filter and remove the internal one so it doesn't get clogged. And I'll be putting the old fuid back in.
The good thing is, if this can be a good thing, you can get a rebuilt trans from Jegs or Summit for about $750-$1200 and put it in yourself. It's a days work but it's not hard as long as you've got a transmission jack.