I recently bought an 02 WRX Wagon, there was a 'whirring' noise coming from the back of the car that sounded like something rubbing, not intense, just a slight 'whirring' u could hear when you were off the gas. So I took it to the dealer, who put it up on the lift, since I was having them do 60k maintenance on it (it has 105k miles on it, and they replaced the timing belt aswell)... Long story short, after running the car up on the lift, and inspecting the rear they tell me that it the bearings are done, and I need a new "Rear Differential, the Front Diff is fine" they also said that one of the axles is sticking out in a slightly unhealthy way. SOOOOOO they say that a new Rear Diff is $1500 and a used one they found with a 1 year warranty is gonna be $600, I dont work on my car, this is my first time owning, I'm not a modder or a tuner, I just want to make sure i'm not getting raped since I probably came off to them as not knowing much about the mechanics behind my WRX. So, is $600 a ripoff for a used Rear Diff for an 02 WRX? I'm seeing used Rear diff's online for $350 but i dont have the technical knowledge to know if i'm looking at the correct part since i'm doing a very random "wrx 02 used rear diff" type search in google.... any feedback would be appreciated, yes I realize i'm a total noob. It's just a stock WRX 02 Turbo Wagon, nothing special. Lemme know what the forum thinks.