Recently my truck started humming/whining in 1st 2nd and 3rd gears when accelerating, it's pretty loud from inside the truck. loud enough that I don't hear my exhaust much(aftermarket).
It kinda of sounds like power steering, but it's not when i'm turning, it's always, I did check my power steering fluid and it was low so i topped it up.
oil level is good, I'm thinking transmission fluid? how do i check if that's it? I want to change the tranny fluid anyways, so i'll probably do that when I can, but what could be some other culprits?
Mt 90 in the tranny?