| 0 | Unser, Jr. / Unser / Unser / Unser | Jochen Dauer Racing (D) | | Porsche | 962 | C | Porsche | GTP |
| 00 | Andretti / Andretti / Andretti | Jochen Dauer Racing (D) | | Porsche | 962 | C | Porsche | GTP |
| 04 | Scolo / Burgner / Macaluso / *Brosnaham | Henry Brosnaham | | Chevrolet | Camaro | | Chevrolet | GTO |
| 06 | Kimbrough / Overbagh / *Montgomery / *Painter | Overbagh Motor Racing | Hoyt Overbagh | Chevrolet | Camaro | | Chevrolet | GTO |
| 09 | Hynes / Johnson / Robertson / Sheldon | R. J. Racing | | Tiga | GC287 | | Buick | Lights |
| 1 | Luyendyk / Bailey / *Daly | Nissan Performance Technology | | Nissan | R90CK | | Nissan | LM |
| 2 | Jones / Pruett / Boesel / Warwick | Bud Light Jaguar Racing (GB) | | Jaguar | XJR-12 | D | Jaguar | GTP |
| 3 | John Nielsen | Bud Light Jaguar Racing (GB) | | Jaguar | XJR-12 | D | Jaguar | GTP |
| 4 | Bonner / Cope / Kline / Sharp | Tom Milner Racing (USA) | | Spice | SE89P | | Chevrolet | GTP |
| 5 | Brockman / McAdam / Phillips / Davis | Tom Milner Racing (USA) | | Spice | SE89P | | Chevrolet | GTP |
| 6 | Wollek / Schneider / Barilla / Sigala | Joest Racing (D) | | Porsche | 962 | C | Porsche | GTP |
| 7 | Jelinski / Pescarolo / Haywood / Wollek / "Winter" | Joest Racing (D) | | Porsche | 962 | C | Porsche | GTP |
| 9 | Pace / Hessert / Morgan | Essex Racing (USA) | | Kudzu | DG-1 | | Buick | Lights |
| 10 | Cord / Hotchkis / Adams / Dyson | Wynn's (USA) | John Hotchkis | Porsche | 962 | | Porsche | GTP |
| 11 | Gooding / Annis / Kennedy / Northam / Panaggio | Robert Williams | | Chevrolet | Camaro | | Chevrolet | GTO |
| 12 | Fergus / Jones / Schroeder | Whistler Radar (USA) | | Ford | Mustang | | Ford | GTO |
| 15 | Martin / Dallenbach, Jr. / Gordon | Whistler Mustang (USA) | | Ford | Mustang | | Ford | GTO |
| 16 | Weaver / Paul, Jr. / Needell / *Dyson | Dyson Racing (USA) | Rob Dyson | Porsche | 962 | C | Porsche | GTP |
| 20 | Ko / Sheehan / McKay / Monk / *Bobeda / *Jacobson | Carlos Bobeda Racing (USA) | Carlos Pobeda | Tiga | GT287 | | Chevrolet | Lights |
| 26 | Kraft / Job / Pezza / Refenning | Border Cantina (USA) | Alex Job | Porsche | 911 | | Porsche | GTU |
| 28 | Arpin / Olch / Banks / Watkins / *Taylor | Del Russo Taylor | | Chevrolet | Camaro | | Chevrolet | GTO |
| 36 | Grooms / Greenfield / Jellinek / Greenfield | Ecurie Scientific (USA) | | Kudzu | DG-1 | | Mazda | Lights |
| 37 | Espinosa / Wilson / Morejon / Solano | Botero Racing | | Mazda | MX-6 | | Mazda | GTU |
| 38 | Mandeville / Johnson / Marsh | Mandeville Auto Tech (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 42 | Nicol / Tennyson / Brayton | Intersport (USA) | | Tiga | GT286 | | Mazda | Lights |
| 45 | Forbes / Fengler / Hundredmark / Curren / *Keck | First Coast Trucks (USA) | Bob Hundredmark | Chevrolet | Corvette C4 | | Chevrolet | GTO |
| 48 | Johnstone / Cameron / Peterson / Lesnett | Acura (USA) | Don Erb | Spice | SE90P | | Acura | Lights |
| 53 | McDill / McDill / Burt | Hi-Tech Coating | Bill McDill | Chevrolet | Camaro | | Chevrolet | GTO |
| 54 | Dow / Hepworth / ten Cate / *Davis | HDF Motorsport | | Spice | SE89P | | Buick | Lights |
| 57 | Camferdam / Krueger / Oag / Kryder | KrydeRacing (USA) | | Nissan | 240SX | | Nissan | GTU |
| 60 | Cochran / Bell / Bell | Gunnar Porsche | Kevin Jeannette | Gunnar | 966 | | Porsche | GTP |
| 62 | Morton / Fish / *Halsmer | Mazda (USA) | | Mazda | RX-7 | | Mazda | GTO |
| 63 | Redman / O'Steen / Cobb / Halsmer | Mazda (USA) | | Mazda | RX-7 | | Mazda | GTO |
| 66 | Reese / Gagliardo / Hoyt | North Coast Racing (USA) | Brad Hoyt | Mazda | RX-7 | | Mazda | GTU |
| 70 | Gigliotti / Said / Nolan / Schramm / Cunningham | M/J Engineering | | Oldsmobile | Cutlass | | | GTO |
| 72 | Volk / Kjoller / Mooney | Jay Kjoller Motorsports (USA) | Jay Kjoller | Porsche | 911 | | Porsche | GTU |
| 82 | Greer / Bacon / Mees / Uria | Greer Racing (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 83 | Earl / Daly / Robinson / Brabham | Nissan Performance Technology (USA) | | Nissan | R90CK | | Nissan | LM |
| 84 | Bailey / Millen / Luyendyk / Dale / *Earl | Nissan Performance Technology (USA) | | Nissan | R90CK | | Nissan | LM |
| 87 | Hill / Holmes / Puleo / Urrutia / *Boxstrom | A & R Auto Electric (USA) | Anthony Puleo | Chevrolet | Camaro | III | Chevrolet | GTO |
| 90 | Stevens / Bennett / Grunnah / Jaeger | Roush Racing (USA) | | Ford | Mustang | | Ford | GTO |
| 91 | Hayner / Knowles / Heinricy / Lagasse / Morrison / *Pilgrim | EDS/Mobil/Goodyear | Tommy Morrison | Chevrolet | Corvette | ZR-1 | Chevrolet | GTO |
| 92 | Smith / Pilgrim / Bundy / Varde / *Lagasse / *Morrison | EDS/Mobil/Goodyear | Tommy Morrison | Chevrolet | Corvette | | Chevrolet | GTO |
| 95 | Leitzinger / *Loring / *Kurtz / *Leitzinger | Fastcolor Auto Art (USA) | | Nissan | 240SX | | Nissan | GTU |
| 96 | Kurtz / Leitzinger / Loring / Reynolds / *Leitzinger | Fastcolor Auto Art (USA) | | Nissan | 240SX | | Nissan | GTU |
| 98 | Dismore / Moran / Jones | All American Racers (USA) | Dan Gurney | Eagle | HF89 | | Toyota | GTP |
| 99 | Fangio II / Ribbs / Wallace | All American Racers (USA) | Dan Gurney | Eagle | HF89 | | Toyota | GTP |