My 03 wrx which i bought for my wife started making noise after @ 15 minutes driving at highway speed i've looked through a few threads and i'm just wondering if its most likely trans. or rear diff.? the noise dosen't change w/ throttle position, only speed. I'm leaning tward trans. but hoping for a diff.(hope for the best but plan for the worst). from what i can gather a trans. build will cost @ 4-5K if i have to do it i'm gonna pull the trans my self and take it to the guys at andrew tech, @ a 6hr ride. i don't see the point in doin it more than once. But, if its the diff. where can i get a decent rebuild kit, again i dont want to have to do it again if i can halp it. i have some mechanics that i'm more than confident can handle that. i really appreciate all the help i can get. i hope my final #'s to be @600 at the flywheel.