Well I searched around but can't find anything on the exact condition I have. I have a '83 GSL which makes metalic grinding when making turns. It's coming from the rear. I put on new rotors and brakes in the back but still the same thing. It does not matter if you hit the brakes or not. Is it the LSD?

 

Try installing a high quality synthetic gear oil in your rear. I had a shuttering outa mine when I turned but after I installed Redline 75w90 with the built-in friction modifiers the shuttering went away. Good luck!

 

Thanks. I wish I just had a shudder. It is making a metalic grinding noise.

 

Could be bearings.

Or, try changing the diff fluid anyway, you may get evidence of a stuffed center. If you get bits of metal coming out in the fluid you'll know for sure where your problem lies.

 

I'm going to dump the fluid and check for metal. I don't think it is the axle bearings. Usually they roar and get louder when you load the car from side to side. My car is silent until you make a turn, then grind-grind.

 

I had a bent axle and the brake would make a loud grinding noise when cornering. Might want to check that out.

 

Get under the car and check out the drive shaft. If the rear end is out(as in the car has been bumped or something), and your car is lowered, the drive shaft can rub on the tunnel. Mine did this when I started autocrossing. If so, check out your Watts Link, might be bent??

 

I know that the rear swaybar link is disconnected on one side (rusted off). Would this cause the grinding? Sounds like I need to take a good look at the axles and rear.

 

Doubt it....I race without a rear swaybar. Also, check out all of your bushing joints, maybe one is worn out and you have metal to metal grinding????

 

Well I dumped the fluid and it was perfectly clear. And all the links look good. There is some evidence that the rear leaks from the seals but it was full of fluid. Car still makes a metalic scraping when turning. I am baffled. I may pull the axles or just take it to Mazda...

What does it sound like when the LSD goes bad?

 

My '83 GSL started to make a simliar noise within a few months of bringing it home form the dealer. I have had it checked at least a dozen times in the almost 20 years I've owned the car and not one mechanic can figure it out. It mostly happens in very warm weather, while making a left turn - sounds like rear (disc) brakes rubbing or vibrating.

Brake pads have been changed, dealer changed entire rear braking system (when the car was new under warranty), rear differential fluid has been changed (including the special limited slip additive). Sorry I don't have an answer for you.

 

mine grinds too, but it is under all conditions. just really bad when i turn. that is why i have an se swap ready to go in. oops, i didn't really answer anything either did i? mr beam has no answers too.

 

I think it's the bearings. I changed mine about 5 yrs ago.. not that bad of a job. Just got bearings pressed off and on.

 

It sounds a lot like the LR rotor is scraping against something when I make right turns. I'm going to pull the wheel and rotor to see what's up...

 

Like I said before, it sounds just like the bent axle I had. Try jacking the rear-end up and running the car in gear. That way you can watch the rotor to see if it appears 'warped' or if the caliper is pulsing as the rotor turns. If it is then you probably have a bent axle.

 

What happens if the bearing collar is loose? Seems that the rotor hits the caliper mount when turning right.