I have losi 8ight E 2.0 with 45t on stock center diff. Got the center smart diff(losa3601) and it has 48t and rubs on the chassis. Looks like 43t, 44t, & 45t are the correct spur gears for my car. Its says its a dirrect drop in then why would it come with a gear thats to big to fit in the car?