weird noise after disengaging 4wd?
 

i should've asked this long ago, but i forgot about it. so anyways when i disengage 4wd, i hear a high-pitched whine. it's not super loud or anything, but i notice it. i can only think of one other time it did this, which was a long time ago. i don't use 4wd that much either.

anyone know what it could be?