Mitsubishi Lancer Forum : “What is the average life of a Lancer 2003 automatic transmission? thanks. ”

Well, being a Mitsubishi, I would not expect it to last 100,000.  You know how Chryslers had horrible
transmissions?  Those were all made by Mitsubishi/of a Mitsubishi design.

My '03 Lancer has over 120,000 miles on it.  Zero problems so far.

prob at least 200k i would think unless you beat on it.

well the reason why chryslers transmissions are horrible is because they buy them from mitsubishi they dont make there own so what do they do? they buy them with the cheapest and lowest parts possible to save on cost. So that doesnt mean that mitsubishi cars have bad transmission because they make there own.

Honestly it all depends on how well you take care of them.  Change the fluid and filter regularly, don't abuse it, keep the coolant regularly changed and filled too, and you will get 200-300k easy.