JERKY SHIFTING , is it ecu malfunction ?

[dentist]

hiya thr ! dudes my bB has done 6ok kms , on a freeway it lost acceleration in D , i chkd wid 2 , i went ok for a while thn it was smoke all over n O/D light start blinking, i stopped da car, after opening the hood, i found out the ATF spilled al over the engine which was causing smoke. i'd to wait for a while so that the engine cools of. then i checked the ATF it was ok, strange, anyways i started the car , it was not at all smooth, gears were changing at thr own will. i changed the oil, cleaned the gear filter, nothing happened. then was told to change the gear box as overheating of oil has caused the damage. i changed the gear , not once but twice, but the problem remains the same, i chkd wid scanner n the temp of ATF climbs upto 118 , in my opinion its the ecu mlfunctioning which is sending wrong pulse at wrong time, means at 3000RPM the ecu orders the gear to come down to 2nd n vice versa. to my astonishment thr is no check light, scanner is unable to pick up any fault code. EXPERTS plz help ,, thnxo