Diff Case Spreader...
#2
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I tried to install mine without one. I ended up breaking the shims trying to get everything hammered back in. I built a case spreader with some 1/2" allthread, 1 1/4" box steel and bolts that I ground to fit in the holes of the case. Worked like a champ.
#4
I worked for gm for 15 years and never used a case spreader on a 8.6. I have probably built 100+ 8.6 rear axles and never had a problem. With the trutrac you can usually reuse the original shims in there original location. Be sure to check you're backlash before you take it apart and make sure its the same when you're done, if you're reusing the ring and pinion.