Sounds like a trailing arm got bent somewhere along the way...
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97 Riviera L67 - Desert Sandstone - Gutted AB Lid, Kool Blue AF, 180* SuperStat, Hogan 3" DP, ZZP 3.6" MPS; Sensa-Trac struts, Rockford-Fosgate 6x9's; Annoyance-Fixes: Express-Down delete, Full-time juice to Power Port, BRP-power to Glovebox lite, Brake-to-Shift delete, Console-compartment lite, Seat/Mirror Memory in any gear.
69 Wildcat Convertible, 430" QJet - Burgundy/Black - P/Win, P/Seat, P/Ant, Tilt, Cruise, Remote Trunk, Rallyes, AM/FM Mono!