yes trans fluid is good. checked it when the engine was hot.
just serviced it yesterday but problem didn't go away, even added lucas tranny fix.

just drove it today, car still sounds like a toy car that's trying hard.
checked if there were any slips, and no. tranny shifts ok the way it always has and RPMs still normal.
it sounds like i'm revving up the car as if the RPMs read 4000 or 5000.
but i'm only going 2000 - 3000 at most. (casual driving, no highway)

car makes the noise at all gears, even when idle. Though when idling it is very minimal.
Idling: low noise
1-3 gear: noise is clearly heard
4 gear (after it reaches 45mph): noise is lower but higher than idle.
(I tink i got the gears right)

i'll shoot a video of my car specifically later on. I even changed the oil to a full synthetic one. Nothing.