its kind of a high pitch noise that only happens when its under a good amount of load and about to shift to the next gear.

idk what it is. but the truck still shifts fine. isnt getting the OD off light flash. so idk what the deal is and if i need to be weary of it or not.

 

check the fluid level? whens the last time it was flushed? how many miles on it?

 

30k miles on it. had regular maintenence on it probably like 15k miles ago? not long after i got it.