Ok, so I did some custom work on my rear suspension. I've got about 3 degrees of inward castor (pointing toward center) on my driver side rear wheel. When I'm driving down the high way that left rear side is making a lot of noise almost like the tire to pavement sound but really loud. I tried rotating the tires to see if it would fix the problem, but it didn't. I'm thinking that maybe the castor is making the noise or else I need a new wheel bearing.

When I'm turning hard right at 50mph or more the sound gets louder. When I turn left the sound gets quieter. Any body think they know what's going on?

 

Inward castor? Wouldn't you consider it forward castor? Isn't castor only relevant for the front wheels?

 

It's inward castor, but I have custom castor arms for the rear as well. Normally it's not adjustable.

 

that is usually the sound of a bad wheel bearing.

When you turn right the sound gets louder because more load is placed on the left wheel bearing resulting in sound getting louder.

 

I'm going to try a test with my spare tire. It's so skinny that there should be no vibration or tire noise coming from it while I'm driving. If it's still making the noise with the spare then I can be more sure that it's a wheel bearing.

 

I am confused by inward castor. Please explain more.

 

Inward castor is when your wheel is pointing toward the center of your car. You might hear someone say toe in.

Outward castor is when your wheel is pointing outward like toe out

It's different than camber. Camber is vertical

 

Most folks know that at toe-in and toe-out.

3* of toe-in on just the back left is an insane amount of toe, and you are scrubbing the tire across the pavement.

What are these custom mods that you did?

 

My rear crossmember got bent in during a crash. It made my alignment off on my rear wheel driver side. Instead of replacing the crossmember I did custom camber and castor arms to re align the wheel. I think they might be off a little bit still. Car drives straight on when i let go of the wheel and doesn't pull to any one side. I figured everything was cool right!? However my car makes a noise like a loud tire on pavement when I'm turning hard right. I think it's a wheel bearing making the noise because the rear axel was replaced with one from a junk yard. Lately I lowered it with 1" Tein S springs just this week. Now it pulls to the right a bit. I know my car is jacked up a bit, but I'm not trying to spend $1100+ on a new crossmember for a little toe in that can be fixed with adjusting the castor and camber arms.