It would have a metal tag on the diff that will say limited slip and another tag with the axle identification on it. Like 44a. Or you can request your build sheet from Chrysler via email. The oil weight will not cause a grinding noise. It's probably a carrier bearing or pinion bearing maybe. That is if you are sure that it's coming from the rear.
Why do you have two threads on the same topic?
Originally Posted by jabba974
"And yes, there is always a torque spec...but its not necessary...and takes way to much time...."