If you gotta pull the third you may as well remove all the studs and replace with bolts through from the inside like the trail-gear set. At least this way your chances of pulling the stud out are minimal.
http://www.trail-gear.com/diff.html

90 Xcab V6
3.0 Rebuilt/Balanced
P/P w/OS valves
Downey Hdrs,Jacobs Ign
5.29's,Tru Trac+Lockright
4"TG SAS+Rear Kit on 35's
(DOA Racing = $1200 lesson <img src="/forums/images/graemlins/angry.gif" alt="" />)
www.performancecylinderheads.com