Just curious when people have had their transmissions die.

I may just be paranoid, but every since I found out my transmission is made by GM, I feel like it is gonna die.

I have a 03 3.0i with 111k. The transmission is fine on flat roads, but seems to shift harder on mountain roads. I have not seen any slippage yet, just hard shifts that I am not used to. (probably standard on most GM cars)

Also I have been afraid to change the ATF filter after reading some posts where it went bad after new fluid was put in. And I have not done the diff fluids either.