8-3/4 crush sleeve eliminator

I have a 489 housing 8-3/4" with what I assume has a crush sleeve that has lost tension. I get a growl around 70mph and up. The gears only have about 4000 miles on them. I was battling a driveline vibration for a while, which is now solved, but I'm thinking that vibration may have taken a toll on the crush sleeve. Can I simply take gear apart and replace the crush sleeve with the eliminator Dr. Diff sells and put it back together? Is there anything special required to install the eliminator kit?