Previously, General Motors used the G-body designation for unrelated mid-sized cars.

By the turn of the millennium, full-sized cars from four different GM makes were using some derivative of the platform.

GM literature noted the need to use a 'frame crusher,' designed to test heavy-duty truck frames, to finally break the G-body structure in their crush-to-failure procedures.

The G platform vehicles were also noted for having belt-in-seat style seat belts like the mid-size GMT360 SUVs.

[3] The final car using this platform was the Buick Lucerne, which ended production in June 2011.