| 0 | Jelinski / Pescarolo / Ricci | Joest Racing (D) | Reinhold Jöst | Porsche | 962 | C | Porsche | GTP |
| 00 | Showket / Knowles / Hanneman / Davies | Full Time Racing (USA) | | Dodge | Daytona | | Dodge | GTU |
| 01 | Allison / Hepworth / Dow / Sutcliffe / Hodgetts | Racecraft International (USA) | | Spice | SE87L | | Pontiac | Lights |
| 04 | Brosnaham / McElheny / Burgner / *Caniglia / *Cerveney | Spirit of Brandon | Henry Brosnaham | Chevrolet | Camaro | | Chevrolet | GTO |
| 07 | Hayner / Buhl / *Davies | Full Time Racing (USA) | | Dodge | Daytona | | Dodge | GTU |
| 1 | Forbes-Robinson / Morton / Halsmer / *Downing | Downing/Atlanta (USA) | | Mazda | RX-7 | | Mazda | GTO |
| 2 | Stuck / Grohs / Haywood / Herzog | Alucraft/Shapiro Motorsports | | Porsche | 962 | | Porsche | GTP |
| 3 | Larrauri / Brun / Sigala | Brun Motorsports (CH) | | Porsche | 962 | C | Porsche | GTP |
| 4 | Schubot / Lopez / Ludemann | S&L Racing (USA) | | Spice | SE88P | | Buick | Lights |
| 6 | Herzog / Grohs | Tom Milner Racing (USA) | | Ford | Mustang Probe | | Ford | GTP |
| 8 | Morgan / ten Cate / Hessert | Essex Racing (USA) | | Spice | SE88P | | Buick | Lights |
| 9 | de Lesseps / Cochran / Morrison | Essex Racing (USA) | | Spice | SE88P | | Buick | Lights |
| 10 | Adams / Hotchkis, Jr. / Hotchkis | Wynn's (USA) | John Hotchkis | Porsche | 962 | | Porsche | GTP |
| 11 | Schroeder / Jones / Lappalainen / Pruett | Tru-Cur/Roush Racing (USA) | Jack Roush | Mercury | Cougar | VII XR-7 | Ford | GTO |
| 12 | McKay / Ko / Hunter, Jr. / Magana | Carlos Bobeda Racing (USA) | Carlos Pobeda | Tiga | GT287 | | Chevrolet | Lights |
| 15 | Gordon / Fish / St. James | Tru-Cur/Roush Racing (USA) | Jack Roush | Mercury | Cougar | VII XR-7 | Ford | GTO |
| 16 | Dyson / *Weaver / *Pruett / *Schuppan | Dyson Racing (USA) | Rob Dyson | Porsche | 962 | C | Porsche | GTP |
| 17 | Boesel / Unser, Jr. / Unser / *Dauer | Dauer Racing (D) | Jochen Dauer | Porsche | 962 | C | Porsche | GTP |
| 18 | Holland / Green / Chambers | Rick Holland (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 21 | Rubright / Upton / Urrutia | Budweiser | Craig Rubright | Chevrolet | Camaro | | Chevrolet | GTO |
| 23 | Adam / Laporte / *Goodyear / *Seabroke | DSR Motorsports | | Porsche | 962 | GTi | Porsche | GTP |
| 26 | Kraft / Johnson / Job / McCall | Border Cantina (USA) | Alex Job | Porsche | 911 | | Porsche | GTU |
| 28 | Garcia / Garcia | Raul Garcia (USA) | Raul Garcia | Pontiac | Firebird | | Pontiac | GTO |
| 29 | Church / Montgomery / Taylor / Arpin / Overbagh / *De Long | Overbagh Motor Racing (USA) | Hoyt Overbagh | Chevrolet | Camaro | III | Chevrolet | GTO |
| 30 | Moretti / Bell / Dickens / *Los / *Phillips | Momo (D) | | Porsche | 962 | C | Porsche | GTP |
| 31 | Los / Gebhardt / Mundas | Momo (D) | Günter Gebhardt | Gebhardt | 88 C2 | | Audi | GTP |
| 33 | Jourdain / Kline / *Matsushita / *Atchison | Panasonic/Carlos & Charlies (GB) | Gordon Spice | Spice | SE90P | | Chevrolet | GTP |
| 36 | Grooms / Greenfield / Jellinek / *Greenfield | Erie Scientific Racing | | Argo | JM16 | | Mazda | Lights |
| 37 | Bacon / Hogdal / *Finger / *Stewart | Mazda Motorsports (USA) | Roger Mandeville | Mazda | MX-6 | | Mazda | GTU |
| 38 | Mandeville / Marsh / Finger / Stewart / Hogdal / *Bacon | Mazda Motorsports (USA) | Roger Mandeville | Mazda | MX-6 | | Mazda | GTU |
| 40 | Bieri / Tennyson / *Graham | Bieri Racing (CDN) | Uli Bieri | Tiga | GT286 | | Ferrari | Lights |
| 41 | Cogbill / Gibson / Kreider / *Young | Young Racing (USA) | | Chevrolet | Beretta | | Chevrolet | GTO |
| 42 | Cherry / Higgins / Monk / McAdam | Motorsports Marketing | John Higgins | Fabcar | CL | | Porsche | Lights |
| 43 | Wallace / Young / Hoyt / Varde | JVR Engineering, Inc. (USA) | | Pontiac | Fiero | | Pontiac | GTU |
| 47 | Johnson / Pierce | Bezema Buick | Steven Johnson | Argo | JM16 | | Buick | Lights |
| 53 | McDill / Burt / McDill | Hi-Tech Coating | Bill McDill | Chevrolet | Camaro | | Chevrolet | GTO |
| 54 | Segall / Davis / Payvis / Cerveney / Davis | Race Power (USA) | Christina B. Snyder | Chevrolet | Camaro | | Chevrolet | GTO |
| 55 | Rocha / Delano / Petery / Manautou / Carter | Fuji Film (USA) | | Spice | SE86CL | | Pontiac | Lights |
| 56 | Auberlen / Northam / Eisenlohr / Auberlen | SP Racing (USA) | Gary Auberlen | Porsche | 911 Carrera | RSR | Porsche | GTU |
| 57 | Kryder / Camferdam / Oag / Pate | Kryderacing (USA) | | Nissan | 300ZX | | Nissan | GTU |
| 58 | Bean / Abreu / Wolfe / *Wonzer / *Westcott | Gary Wonzer Racing (USA) | Gary Wonzer | Lola | T616 | | Mazda | Lights |
| 60 | Cobb / Brundle / Nielsen | Castrol Jaguar Racing (GB) | | Jaguar | XJR-12 | D | Jaguar | GTP |
| 61 | Jones / Lammers / Wallace / *Brundle | Castrol Jaguar Racing (GB) | | Jaguar | XJR-12 | D | Jaguar | GTP |
| 63 | Johnson / O'Steen / Downing / Halsmer | Downing/Atlanta (USA) | | Mazda | RX-7 | | Mazda | GTO |
| 66 | Brundle / Jones / Lammers | Castrol Jaguar Racing (GB) | | Jaguar | XJR-9 | | Jaguar | GTP |
| 67 | Cogan / Paul, Jr. / Baldi | BFG/Miller High Life (USA) | Jim Busby | Nissan | GTP ZX-T | | Nissan | GTP |
| 70 | Reisman / Herbert / Valentine | Paul Reisman Hrg. Inc. | | Argo | JM16 | | Mazda | Lights |
| 71 | Uria / Dotson / Pace / Scott | Peter Uria Racing (USA) | | Mazda | RX-7 | | Mazda | GTU |
| 74 | Dallenbach / Robinson / Unser / Dallenbach, Jr. | 74 Hunting Ranch | | Ford | Mustang | | Ford | GTO |
| 79 | Knott / Winters / Ballot-Léna / Lecerf | Winters/Whitehall (USA) | | Spice | SE87L | | Pontiac | Lights |
| 80 | Finotto / Guatamacchi / Kessel | Bieri Racing (CDN) | | Spice | SE89P | | Ferrari | Lights |
| 81 | Speakman / Duda / Speakman / Novotne | Racers' Cafe | David Duda | Datsun | 240Z | | Nissan | GTU |
| 82 | Greer / Trueman / Mees | Wendy's (USA) | Dick Greer | Mazda | RX-7 | | Mazda | GTU |
| 83 | Earl / Robinson / Brabham / Daly | Nissan Performance (USA) | | Nissan | GTP ZX-T | | Nissan | GTP |
| 84 | Daly / Earl / Robinson / Brabham | Nissan Performance (USA) | | Nissan | GTP ZX-T | | Nissan | GTP |
| 86 | Wollek / van der Merwe / Dobson / *Leven | Texaco Havoline (USA) | | Porsche | 962 | | Porsche | GTP |
| 87 | Puleo / Kennedy / Walsh / Painter | Puleo & Williams Racing (USA) | Anthony Puleo | Chevrolet | Camaro | III | Chevrolet | GTO |
| 90 | Stevens / Schneider / Jaeger / Lappalainen | Escott Capri (USA) | Jack Roush | Mercury | Capri | | Ford | GTO |
| 92 | Schmidt / Briody / Schmidt / Mendoza | Promo Racing | | Argo | JM19 | | Mazda | Lights |
| 95 | Leitzinger / Loring / Leitzinger / *Kurtz | Fastcolor Auto Art (USA) | | Nissan | 240SX | | Nissan | GTU |
| 97 | Heinricy / Beverly / Swett / Morrison | Whitehall Motorsports (USA) | | Spice | SE88P | | Pontiac | Lights |
| 99 | Moran / Olson / Fangio II | All American Racers (USA) | Dan Gurney | Eagle | HF89 | | Toyota | GTP |