i have a nissan maxima 2001..when i put it in drive the car shakes,and every time the gear changes...i already replace the engine mount..can someone help me?

 

The automatic transmission filter is just a screen, no more.
Doesn't really ever need replaced.
Cleaned, maybe.

Check your fluid level with the car running and report back.

A video would help as well.

 

I have the same problem before, I resolved it by dropping ang replacing the transmission pan. Spray the solenoid with contact cleaner. I used the Amsoil OE synthetic ATF. I believe 2001 maxima have electronic Front engine and Rear engine support. Aftermarket electronic engine support can cause engine vibration, you better off using Nissan OEM Genuine parts.