Rubbing/Grinding from rear on right turns

[anumeric]

I tried searching around in the forums, but I'm not sure I have found the right answer yet. I have 215 45 17 tires on the rear and on hard right turns there is this loud rubbing noise. I have checked the brake pads and they are fine. I have noticed that the fender gap between my rear driver's side fender is noticeably lower than the rest of the gaps. I have kyb agx shocks in the rear and they both seem fine and in working order. I do not see a leak. Is the rubbing and sagging related or unrelated?

 

[jtmcinder]

Most 2Gs list to the left, so that might be unrelated. My first guess of the rubbing/grinding is the left rear wheel bearing. Jack up the car and yank on the left rear wheel. If it shakes (while the knuckle stays still), then it's the bearing.

- Jtoby

 

[anumeric]

i would understand maybe the front driver's side sagging since the motor and all of my mighty 130 lbs sits on that side...I tried moving the wheel around when i jacked it up last time, but i will try it again. Oh yea and i forgot to mention that its only on fairly hard right turns only at certain rpms and only when i am in gear...i think that's an important note

 

[jtmcinder]

Ah, that additional information is rather crucial. It's your rear diff. Only when you are making a hard turn does the diff actually, well, do some serious differentiating. That it only makes the noise when torque is being transmitted across the diff (car in gear) and only does it in one direction (right turns) combine to make me suspect a chipped tooth, probably on a spider-gear.

You might ask that this be moved to the drivetrain forum.

- Jtoby

 

[anumeric]

haha i wish i had a differential back there...=( only a gs-t

 

[jtmcinder]

Yeah, that would probably count a lot against my theory, wouldn't it. tee hee

- Jtoby

 

[MrAWD]

My car does the same thing when hard turning to the right (noise comes from the driver side rear tire). In my case it is due to the tire hitting the fender while experiencing heavier weight transfer. Check your tire for any marks from the fender on it. For some reason suspension geometry on that side is different then the other one and compresses more then it should. And this was happening with three different shocks under there (stock, Konis, and with Penskes). Only Penske equipped car was lowered, while the other two used the same stock spring, which might be gone perhaps.

So, check for more marks on both tire and fender and if possible roll that lip under the rear fender to get some extra clearance!


Fedja

 

[jtmcinder]

For some reason suspension geometry on that side is different then the other one and compresses more then it should.

Interesting. I thought that this was either my bad math or unique to my car.

- Jtoby

 

[MrAWD]

Well, that was the only conclusion that made sense to me. If someone has another way of explaining this phenomenon, I am all ears. And I am sorry about your car not being unique...

Fedja

 

[anumeric]

So, check for more marks on both tire and fender and if possible roll that lip under the rear fender to get some extra clearance!


i'll have that done tomorrow thanks for the help i'll keep you guys posted