Mortehl noticed a better shifting after performing the fluid/filter service on his 95 with 156K. Was probably the first service.

If you can do both yourself, it would be great. Draining the trans fluid and replacing it is an easy-to-do job. Changing the filter, which doesn't have to be done in my opinion, every drain is one step more difficult.

Draining and flushing the antifreeze is fairly easy to do if you can take off the lower radiator hose or find the drain valve on your radiator.

I had the Tranny fluid flushed in my '90 LE at 180,000 miles. I did it because the tranny was acting up (harder shifting, kicked out of overdrive). The flush really smoothed the tranny. I figured it would either take care of the problem or make it worse. I was quite pleased with the results. I had it flushed again at 275K with similar results. I now have them flushed every 50K or so.

Keep in mind that a pan drop and filter change only gets 1/3 of the fluid.

Some folks who have problems after a flush may also have this problem -
The trans may be burnt to hell. The fluid, the clutches, bands, converter, seals...

What happens in such a case is the new fluid with it'* detergents and what not basically washes off what is left of the friction linings.

This is a worst case scenario.
But anyways, that is why some folks have problems when having the trans flushed. If it is already beyond the point of a flush helping, then doing the flush may make things worse. As long as the trans like a 60 or 65 is not run real hard very often, it should do fine.

Some trans are doomed to failure like ford'* AX4N or AXOD. Ours are not if taken care of.

When I did my fluid filter change, over 7 quarts drained out. I pretty sure corvettecrazy had the same results. And tech info says 11 quarts is the capacity.
So I'd say the fluid/filter route gets close to 2/3 of the fluid out.

Does that 11 quarts include what is in the converter?

CC used probably 6...plus 1-2ish for the trans cooler pump and flush..(that was a cool thing)

Hmm... I pulled out 6.5 quarts of fluid when I dropped the pan and filter from my car and put back in 6.5 quarts. If that is 1/3 of the fluid, our transmissions have > 18 quarts of total fluid?!

Closer to 12. But it varies from trans to trans how much you get.