Servicing tranny question

Mustang5L5 is on the money.

At the most I would drain the pan, change the filter and refill with new fluid. No flush and I would not drain the converter.

I did a full fluid change on a car once, Dodge Challenger with a 727. I had no real problems before I changed the fluid. About 100 miles later I was pulling the trans out because the fluid had leaked through one of the front seals because the trans had been overheated many times in the past and burnt the seals. The thicker burned fluid wouldn't leak but when I put the thinner new fluid in it didn't take long to end up with a huge cloud of white smoke under the car.

Pulled the trans and had to have it resealed, new pump, one new band, and a new converter put in it. That ended up being a $600 trans fluid change.