Do you think using this rental tool from AutoZone will work?
http://m.autozone.com/loan-a-tools/t..._0_0?location=
Looks like the tap will be no where near long enough to get all the threads but I don't want to drop $25 on a long tap to be shipped to me next week since I'm autocrossing Sunday, I'd like to address it now. I also might try to find a longer one locally. I already had the diff inserts before these, and yes, while NVH has increased, this almost sounds like something is either loose or even overtightened. Like I said, when going over uneven road I get a *tink* noise from either or both sides of the rear. It's strange and unnerving. I'm going to work on the car today and hopefully fix it. Could also be my rear brakes since I just worked on those but I'm not sure. Will report back. Thanks