The solution to the aluminum diff is to have
the hollow between the bolts welded solid.
The other solution is get a steel GV front diff
I welded mine, after I pulled a bolt out, drilled
and tapped it back out, and last time I had the
diff housing out, I got longer bolts, the bolt in the
housing where the gears are is almost poking out
into the gear area, but not quite, the others are
longer too but not quite
Good luck
Wild