Valnar300

I think I broke the mustang (02 GT, manual trans)... Put the new tires on today (274/40/17 from 245/45/17, on the rear only) and after taking a left on the way home I heard a violent clank/clunk noise from the rear. It sounds/feels like the LR tire when it happens, and tends to happen accelerating around corners. It also happens occasionally in a straight line. Its definitely coming from in/around the rear axle. Thoughts?

cliffyk

Make sure the tire store idiots tightened the lug nuts--would not be the first time. If they are tight then you have some problem with the LSD clutch pack(s), spider/side gears or maybe broken axle shaft splines.

Another thought, has the differential oil been changed recently? Is so was the proper amount of friction modifier added (if required with the selected fluid)?

Valnar300

I'm the idiot that changed the tires, and I tightened the lugs to 100 ft/lb. IDK when the diff oil has been changed last, I just got the car in March.

cliffyk

Sorry 'bout that...

You will have to pull the differential cover to change the rear-end fluid--take a good look inside when you've got it opened up...

Valnar300

No harm, you couldn't have known. Although IF that were to happen to me I'd rather have it happen to my car instead of a customers' car.

5sp04GT

How is the clearance with the new tires to the fenders it may be rubbing.

Valnar300

The clearance is fine, I found the issue

cliffyk

That would do it...

Hangwire

Hahaha yes that would do it. Weird coincidence man.

5sp04GT

...well there was kinda a clearance issue maybe