[ScottG]

Originally Posted by clinebarger

If the slip yoke has a "weep hole" in it....You need the sleeve.
If not.....Leave it off.

The weep hole relieves pressure buildup caused by the yoke moving back an forth as the vehicle passes over bumps.

If you have a weep hole & need to reinstall the sleeve....Replace the O-ring GM P/N 3764601

that answers my question, thanks!!