Hi so my car makes a grinding noise when coasting around 42mph.. It started happening when I changed the axle with a new one. It only makes the noise when coasting. It sounds kind of like an 18-wheeler stopping.

 

sounds like a hub bearing in the spindle ( has to be pressed out and pressed in , auto parts stores would or may have the tool or have a shop do it for a fee along w doing a wheel alignment afterwards )