Gentlemen......
First time rookie poster......so don't tear me up too bad.
We drill them all the time.
We even go the other direction and install inserts to go from 7/16 down to 3/8
I do not know exactly when ,or exactly why...But The Dana corp changed ring gear bolt sizes somewhere in the middle of the Gen 2 production is when we started to see them.
We do around 30+ Viper installs a year. So it is kind of a toss up as to what ring gear bolts it has.
If we are sending just a diff to a customer and we know it has 7/16 bolts,we drill it here.
Safety wire and Loc-tite should be standard procedure .
Scotty
Taylor Race Engineering
scotty@taylor-race.com