bro, the auto transmission is rarely a problem, unless you havent got the fluid change since day one you own the car....

the most common problem and issues I always pressed on waja car auto is the auto tranny ecu, which is located below the under the aircond.

Its a design flaw and the condensation from the air cond blower will drip some water into the tranny ecu.

I got this in after around 4 years using the car... I did confronted the proton guys for the design flaw, but they just wont take responsibilites, how ever, i did notice changes of the placement for the tranny ecu after 2005 model.....

if u change the gear box , if the ecu is at fault, your problem will still not solve...

how you know the ecu is not working... well.. when you are in D, the shifting gear which suppose to goes from 1 - 2- 3- 4 maybe now is 1 -2 -3 and never goes to 4, or goes to 4 when it feel happy ... hahah