| 0 | "Winter" / Pescarolo / Wollek / *Ricci | Joest Racing (D) | Reinhold Jöst | Porsche | 962 | C | Porsche | GTP |
| 00 | Showket / Knowles / Hanneman / *Donaldson / *Davies | Full Time Racing (USA) | | Dodge | Daytona | | Dodge | GTU |
| 01 | Sutcliffe / Jones / *Dow | Racecraft International (USA) | | Spice | SE87L | | Pontiac | Lights |
| 04 | Brosnaham / Burgner / McElheny / Figueras | Henry Brosnaham | | Chevrolet | Camaro | | Chevrolet | GTO |
| 07 | Davies / Hayner / *Hanneman / *Knowles | Full Time Racing (USA) | | Dodge | Daytona | | Dodge | GTU |
| 09 | Gutierriz / Vento / Gordillo | Huffaker Racing | | Pontiac | Fiero | | Pontiac | GTU |
| 1 | Halsmer / Forbes-Robinson / Morton / *Downing | Downing/Atlanta (USA) | | Mazda | RX-7 | | Mazda | GTO |
| 2 | Haywood / Herzog / Schubot | René Herzog | | Porsche | 962 | | Porsche | GTP |
| 4 | Ludemann / Schubot | S & L Racing (USA) | | Spice | SE88P | | Buick | Lights |
| 8 | Hessert / Morgan / *Ludemann | Essex Racing (USA) | | Spice | SE88P | | Buick | Lights |
| 9 | Katz / de Lesseps / Cochran | Essex Racing (USA) | | Spice | SE88P | | Buick | Lights |
| 10 | Hotchkis / Adams / Hotchkis, Jr. | Hotchkis Racing (USA) | John Hotchkis | Porsche | 962 | | Porsche | GTP |
| 11 | Schroeder / Jones / *St. James | Roush Racing (USA) | Jack Roush | Mercury | Cougar | VII XR-7 | Ford | GTO |
| 12 | Arpin / Ramsey / Montgomery | Overbagh Racing | | Pontiac | Firebird | | Pontiac | GTO |
| 15 | Gordon / Fish / St. James | Roush Racing (USA) | Jack Roush | Mercury | Cougar | VII XR-7 | Ford | GTO |
| 16 | Weaver / Pruett | Dyson Racing (USA) | Rob Dyson | Porsche | 962 | C | Porsche | GTP |
| 17 | Boesel / Stuck / *Herzog | Dauer Racing (D) | Jochen Dauer | Porsche | 962 | C | Porsche | GTP |
| 20 | Fillip / Cortez / MacInnes | Consulier | | Consulier | GTP | | Dodge | GTP |
| 21 | Rubright / Upton | Craig Rubright | | Chevrolet | Camaro | | Chevrolet | GTO |
| 22 | Burnett / Smith / Ruiz | Gary Smith | | Chevrolet | Camaro | | Chevrolet | GTO |
| 23 | Adam / Harrington / *Seabroke | DSR Motorsports | | Porsche | 962 | GTi | Porsche | GTP |
| 25 | O'Neill / De La Moussaye / Romero | Performance Tech (USA) | Brent O'Neill | Argo | JM19 | | Buick | Lights |
| 26 | Kraft / *Job / *Refenning | Alex Job (USA) | Alex Job | Porsche | 911 | | Porsche | GTU |
| 29 | Generotti / Montgomery / *Church / *Kimbrough | Overbagh Racing (USA) | Hoyt Overbagh | Chevrolet | Camaro | III | Chevrolet | GTO |
| 32 | Lopez / Velez / Piper | Spice Engineering USA (GB) | Gordon Spice | Spice | SE90P | | Buick | Lights |
| 33 | Jourdain / Kendall / Naon, Jr. | Spice Engineering USA (GB) | Gordon Spice | Spice | SE90P | | Chevrolet | GTP |
| 37 | Bacon / Stewart / Finger / *Mandeville | Roger Mandeville (USA) | | Mazda | MX-6 | | Mazda | GTU |
| 38 | Marsh / Bacon / *Mandeville / *Finger / *Stewart | Roger Mandeville (USA) | Roger Mandeville | Mazda | MX-6 | | Mazda | GTU |
| 40 | Bieri / Graham / Tennyson | Bieri Racing (CDN) | Uli Bieri | Tiga | GT286 | | Ferrari | Lights |
| 45 | Jack Boxstrom | Jack Boxstrom | | Pontiac | Firebird | | Pontiac | GTO |
| 48 | Graham / Worth / *Crouch | Red Line Racing | | BMW | 325i | | BMW | GTU |
| 50 | Bartling / Frank / *Hochreuter | Rudy Bartling (CDN) | Rudy Bartling | Porsche | 911 | | Porsche | GTU |
| 55 | Lesnett / Rocha / Qvale | Huffaker Racing (USA) | | Spice | SE86CL | | Pontiac | Lights |
| 57 | Kryder / Oag / Del Vecchio / *Camferdam | Kryderacing (USA) | | Nissan | 300ZX | | Nissan | GTU |
| 58 | Bean / *Wonzer / *Westcott | Gary Wonzer Racing (USA) | Gary Wonzer | Lola | T616 | | Mazda | Lights |
| 60 | Cobb / Nielsen / *Wallace | Castrol Jaguar Racing (GB) | | Jaguar | XJR-12 | D | Jaguar | GTP |
| 61 | Jones / Lammers / Wallace | Castrol Jaguar Racing (GB) | | Jaguar | XJR-12 | D | Jaguar | GTP |
| 63 | Downing / Johnson / O'Steen / *Halsmer | Downing/Atlanta (USA) | | Mazda | RX-7 | | Mazda | GTO |
| 67 | Cogan / Paul, Jr. | Busby Racing (USA) | Jim Busby | Nissan | GTP ZX-T | | Nissan | GTP |
| 70 | Russell / Robinson / Weston / Hofstra | Rising Sun Racing | | Mazda | RX-7 | | Mazda | GTU |
| 71 | Uria / Pace / Dotson | Peter Uria Racing (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 74 | Robinson / Unser / Dallenbach | 74 Hunting Ranch | | Ford | Mustang | | Ford | GTO |
| 77 | Negron / Urrutia / Sereix | Juan Carlos Negron (PR) | | Mazda | RX-7 | | Mazda | GTU |
| 79 | Knott / Hinze / Miller | Whitehall Motorsports (USA) | | Spice | SE87L | | Pontiac | Lights |
| 80 | Finotto / Melgrati / Guatamacchi | Bieri Racing (CDN) | | Spice | SE89P | | Ferrari | Lights |
| 82 | Greer / Mees / Hogdal | Dick Greer Racing (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 83 | Daly / Earl / *Brabham / *Robinson | Nissan Performance Tech. (USA) | | Nissan | GTP ZX-T | | Nissan | GTP |
| 84 | Daly / Robinson / Brabham | Nissan Performance Tech. (USA) | | Nissan | GTP ZX-T | | Nissan | GTP |
| 86 | Wollek / Dobson / van der Merwe | Bruce Leven (USA) | | Porsche | 962 | C | Porsche | GTP |
| 87 | Puleo / Painter / Irwin / *Walsh | Anthony Puleo (USA) | Anthony Puleo | Chevrolet | Camaro | III | Chevrolet | GTO |
| 90 | D'Agostino / Kelton / *Church / *Generotti | Louis D'Agostino | | Mazda | RX-7 | | Mazda | GTU |
| 91 | Titus / MacInnes / Fillip | Consulier | | Consulier | GTP | | Dodge | GTP |
| 95 | Loring / Leitzinger / Kurtz / *Leitzinger | Leitzinger Racing (USA) | | Nissan | 240SX | | Nissan | GTU |
| 98 | Olson / Fangio II / *Moran | All American Racers (USA) | Dan Gurney | Eagle | HF89 | | Toyota | GTP |
| 99 | Moran / Ribbs / *Olson / *Fangio II | All American Racers (USA) | Dan Gurney | Eagle | HF89 | | Toyota | GTP |