The S&W welded frame for the 78-88 GM ?G? body is designed to fit up to 15 x 33 drag tires or 31x18.5 Hoosier street radial tires. This frame comes completely welded with 2 x 3" mandrel formed frame rails, front crossmember, 4-link front mounts, rear shock crossmember with upper shock mounts and a panhard bar mount and is completely jig-welded ...