Ratech Smart Sleeve (Pinion Spacer/Crush Collar) GM 12-Bolt

The bulge area is restricted to two areas with the majority of the deformation taking place on the flat of the bulge.

Installation characteristics are a consistent thrust pressure for the entire length change of the spacer.
Typical required fastener torque to compress the spacer is approximately half of the current design.

The usable compression distance is .095 in length.

Cycle duty is better than a solid spacer and shim pack.