| 04 | Brosnaham / Roberts / Scolo / Mazzacane / Andison | Henry Brosnaham | | Chevrolet | Camaro | | Chevrolet | GTO |
| 05 | Carter / *Delano / *Petery | Milner Racing | | Fabcar | GTP | | Chevrolet | GTP |
| 06 | Kimbrough / Montgomery / Overbagh | HiTex Corp. | | Chevrolet | Camaro | | Chevrolet | GTO |
| 09 | Johnson / Robertson / Sheldon | R. J. Racing | | Tiga | GC287 | | Buick | Lights |
| 1 | Brabham / Robinson / Daly / Earl | Nissan Performance (USA) | | Nissan | NPT-90 | | Nissan | GTP |
| 2 | Jones / Acheson / Boesel | Bud Light/Jaguar Racing (GB) | | Jaguar | XJR-12 | D | Jaguar | GTP |
| 3 | Jones / Boesel / Nielsen / *Acheson | Bud Light/Jaguar Racing (GB) | | Jaguar | XJR-12 | D | Jaguar | GTP |
| 4 | Bonner / Sharp / Kline | Tom Milner Racing (USA) | | Spice | SE89P | | Chevrolet | GTP |
| 5 | McAdam / Purner / Phillips | Tom Milner Racing (USA) | | Spice | SE89P | | Chevrolet | GTP |
| 6 | Wollek / Schneider / Sigala | Joest Porsche Racing (D) | | Porsche | 962 | C | Porsche | GTP |
| 7 | Jelinski / Pescarolo / "Winter" | Joest Porsche Racing (D) | | Porsche | 962 | C | Porsche | GTP |
| 8 | Morgan / Pace | Essex Racing (USA) | | Kudzu | DG-1 | | Buick | Lights |
| 9 | Hessert / Los | Essex Racing (USA) | | Kudzu | DG-1 | | Buick | Lights |
| 10 | Cord / Adams / Hotchkis | Hotchkis Racing (USA) | John Hotchkis | Spice | SE90P | | Pontiac | GTP |
| 12 | Schroeder / Fergus / *Gordon | Roush Racing (USA) | | Ford | Mustang | | Ford | GTO |
| 15 | Jones / Gordon / *Schroeder | Roush Racing (USA) | | Ford | Mustang | | Ford | GTO |
| 17 | Beckett / Lieb / McElheny | Beckett Racing | | Chevrolet | Corvette | | Chevrolet | GTO |
| 18 | Evans / Robinson / Bobeda | Carlos Bobeda Racing (USA) | | Spice | SE90P | | Buick | Lights |
| 21 | Herzog / Haywood / *Taylor / *Mueller | Alucraft | | Porsche | 962 | | Porsche | GTP |
| 24 | Weaver / Paul, Jr. / *Shirazi | Shapiro Motorsports | John Shapiro | Porsche | 962 | GTi | Porsche | GTP |
| 26 | Job / Kraft / Refenning / *Smith | Alex Job Racing (USA) | Alex Job | Porsche | 911 | | Porsche | GTU |
| 30 | Moretti / Mundas / Dickens | Momo/Gebhardt Racing (D) | | Porsche | 962 | C | Porsche | GTP |
| 33 | Coppelli / Hill | Spice Engineering USA (GB) | Gordon Spice | Spice | SE90P | | Buick | Lights |
| 37 | Wilson / Solano / Lopez / Espinosa | Botero Racing | | Mazda | MX-6 | | Mazda | GTU |
| 40 | Bieri / Graham | Bieri Racing (CDN) | | Alba | AR2 | | Ferrari | Lights |
| 41 | Russell / Graham / Worth | Red Line Racing | | BMW | 325i | | BMW | GTU |
| 48 | Johnstone / Peterson | Comptech Racing (USA) | Don Erb | Spice | SE90P | | Acura | Lights |
| 52 | Peters / *Bupp | Ken Bupp (USA) | | Chevrolet | Camaro | | Chevrolet | GTO |
| 53 | McDill / McDill | Bill McDill | | Chevrolet | Camaro | | Chevrolet | GTO |
| 54 | Dow / Tennyson / Knott | HDF Motorsports | | Spice | SE89P | | Buick | Lights |
| 57 | Kryder / Del Vecchio / Danaher | Kryderacing (USA) | | Nissan | 240SX | | Nissan | GTU |
| 62 | Fish / Halsmer / Morton | Mazda (USA) | | Mazda | RX-7 | | Mazda | GTO |
| 63 | O'Steen / Cobb / Redman | Mazda (USA) | | Mazda | RX-7 | | Mazda | GTO |
| 69 | Hoyt / Reese | North Coast Racing (USA) | Brad Hoyt | Mazda | RX-7 | | Mazda | GTU |
| 70 | Said / Schramm / Nolan | Auto Concepts | | Oldsmobile | Cutlass | | | GTU |
| 72 | Kjoller / Mooney / Volk | Jay Kjoller Motorsports (USA) | Jay Kjoller | Porsche | 911 | | Porsche | GTU |
| 75 | Dale / Millen / O'Connell | Cunningham Racing (USA) | | Nissan | 300ZX | Turbo (Z32) | Nissan | GTO |
| 76 | O'Connell / *Dale / *Millen | Cunningham Racing (USA) | | Nissan | 300ZX | Turbo | Nissan | GTO |
| 77 | Dale / Millen / O'Connell | Cunningham Racing | | Nissan | 300ZX | Turbo | Nissan | GTO |
| 80 | Melgrati / Finotto / Velez | Bieri Racing (CDN) | | Spice | SE89P | | Ferrari | Lights |
| 82 | Greer / Bacon / Uria / *Mees | Greer Racing (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 83 | Brabham / Daly / Brabham / *Robinson / *Earl | Nissan Performance (USA) | | Nissan | NPT-90 | | Nissan | GTP |
| 84 | Robinson / Earl / Bailey / *Brabham | Nissan Performance (USA) | | Nissan | NPT-90 | | Nissan | GTP |
| 87 | Puleo / Annis / Panaggio / Walsh | Powertron (USA) | Anthony Puleo | Chevrolet | Camaro | III | Chevrolet | GTO |
| 90 | Stevens / Jaeger / Walker | Roush Racing (USA) | | Ford | Mustang | | Ford | GTO |
| 91 | Hayner / Lagasse / Knowles | Morrison Motorsports | Tommy Morrison | Chevrolet | Corvette | ZR-1 | Chevrolet | GTO |
| 92 | Pilgrim / Smith / *Morrison | Morrison Motorsports | Tommy Morrison | Chevrolet | Corvette | | Chevrolet | GTO |
| 94 | Generotti / Tavilla / Church | Guy W. Church (USA) | Guy W. Church | Mazda | RX-7 | | Mazda | GTU |
| 95 | Leitzinger / Loring / *Leitzinger / *Kurtz | Leitzinger Racing (USA) | | Nissan | 240SX | | Nissan | GTU |
| 96 | Leitzinger / Kurtz / *Leitzinger / *Loring | Leitzinger Racing (USA) | | Nissan | 240SX | | Nissan | GTU |
| 98 | Moran / Wallace | All American Racers (USA) | Dan Gurney | Eagle | HF90 | | Toyota | GTP |
| 99 | Fangio II / Ribbs | All American Racers (USA) | Dan Gurney | Eagle | HF90 | | Toyota | GTP |