Yeah, it was a typo on the 525's diff... it has the 4.1 in it. Problem being (with driving the 525) is some idiot ran a red light and I clipped him, then he drove off. There's damage to the front of the car and the electrical is dieing (wipers stopped working, no power options, no stereo, no computer, etc...) so I got the 535 to replace it... but the rear diff has been worn and now it howls when the car coasts in gear. I'm not worried about max mph. so much, as long as I can get up to 100 I'm happy.