My buddy has a late 90s S10 Blazer. The thing is a bit of an oddity. It has every option(except the ZR2 package) but is 5 speed. It even has an 8.5" 10 bolt under the back. So does anyone have a clue what spline count the axleshafts are? He wants to get a spool since he killed the factory locker and found out they are considered junk by the ZR2 guys. I figured 30 spline, he says Summit has, 28, 30, and 33 spline. Anyone?