Yea that repair is for most 82-89 camaros and 82-85 birds
There are threads about the issue with the '86+ birds.
It's usually an internal cluster motor/gear issue.
You can send out the cluster for repair, try to fix it yourself(once you see whats wrong), or it may be as simple as something jamming it up that needs to be removed or lubed.
Not a hard task to tear down and get into, but not something a beginner should attempt.
