Transmission

When I changed out the fluid it looked and smelt burnt then started car put in D-4 nothing first nothing reverse something until operating temperature then nothing. Check the fluid level I had to drain fluid started the car went through the gears with same result checked fluid level again and still had to drain more. Replaced lock-out - speed sensor, dual linear valve with no change in reverse movement forward gears only first a little movement in idle step on gas now nothing in reverse step on gas still in gear until operating temperature then nothing at all. Checked fluid level again and had to drain more out what do you think transmission is m7za #1021964 and I thank you for any ideas.