transmission has worn/bad seals.should have a trans shop check it. Most don't charge to check.
To change the transmission fluid on your Chevy Malibu 2005, first, pull off the pan, drain the fluid, and replace it.
A 2004 Chevy Malibu uses standard Dexron III transmission fluid. This is a widely available fluid used by many GM vehicles.
Dexron
Dextron
9 liters
Dexron VI
200 Chevy Malibu has a sealed system, so it does not have a dipstick to check the transmission fluid. If there are issues, one has to check the fluid while the car is running.
There should be two dipsticks under the hood on a Malibu. One will be plainly marked "OIL" or "ENGINE OIL." The other one is your transmission fluid. This is assuming your Malibu has automatic transmission. If your Malibu has a manual transmission (stick shift), then there is no dipstick for transmission fluid -- manual trannies get lubrication from the engine oil.
The transmission fluid capacity of a 2004 Chevy Malibu is approximately 7.5 quarts. The actual capacity varies depending on the amount of fluid in the torque converter.
The transmission fluid capacity is 6.9 quarts (it requires Dexron III fluid).
DEXRON 3
I used up to 4 on my 1998 malibu.