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GP of South Africa Kyalami 4-3-1978, 78 laps of 4.104 m, Total distance 320.112 m
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| Po | No | Driver | Team-engine | Diff | Reason |
| 1 | - | Ronnie Peterson | Lotus-Ford 78 | 1:42:15.767 | - |
| 2 | - | Patrick Depailler | Tyrrell-Ford 008 | -0.466 | - |
| 3 | - | John Watson | Brabham-Alfa Romeo BT46 | -4.442 | - |
| 4 | - | Alan Jones | Williams-Ford FW06 | -38.986 | - |
| 5 | - | Jacques Laffite | Ligier-Matra JS7 | -1:09.218 | - |
| 6 | - | Didier Pironi | Tyrrell-Ford 008 | -1 lap | - |
| 7 | - | Mario Andretti | Lotus-Ford 78 | -1 lap | - |
| 8 | - | Jean-Pierre Jarier | ATS-Ford HS1 | -1 lap | - |
| 9 | - | Rolf Stommelen | Arrows-Ford FA1 | -1 lap | - |
| 10 | - | Hector Rebaque | Lotus-Ford 78 | -1 lap | - |
| 11 | - | Brett Lunger | McLaren-Ford M23 | -2 laps | - |
| 12 | - | Vittorio Brambilla | Surtees-Ford TS19 | -2 laps | - |
| 13 | 35 | Riccardo Patrese | Arrows-Ford FA1 | -15 laps | Engine |
| 14 | - | Jody Scheckter | Wolf-Ford WR1 | -19 laps | Spun |
| 15 | - | Patrick Tambay | McLaren-Ford M26 | -22 laps | Collision |
| 16 | - | Gilles Villeneuve | Ferrari 312T3 | -23 laps | Oil leak |
| 17 | - | Carlos Reutemann | Ferrari 312T3 | -23 laps | Spun |
| 18 | - | Rupert Keegan | Surtees-Ford TS19 | -26 laps | Oil line |
| 19 | 1 | Niki Lauda | Brabham-Alfa Romeo BT46 | -26 laps | Engine |
| 20 | - | Jochen Mass | ATS-Ford HS1 | -35 laps | Engine |
| 21 | - | Arturo Merzario | Merzario-Ford A1 | -39 laps | Suspension |
| 22 | - | Jean-Pierre Jabouille | Renault RS01 | -40 laps | Engine |
| 23 | - | Keke Rosberg | Theodore-Ford TR1 | -63 laps | Clucth |
| 24 | - | Emerson Fittipaldi | Copersucar-Ford F5A | -69 laps | Transmission |
| 25 | - | Eddie Cheever | Hesketh-Ford 308E | -70 laps | Oil leak |
| 26 | - | James Hunt | McLaren-Ford M26 | -73 laps | Engine |
| 27 | - | René Arnoux | Martini-Ford Mk23 | DNQ | - |
| 28 | - | Clay Regazzoni | Shadow-Ford DN8 | DNQ | - |
| 29 | - | Lamberto Leoni | Ensign-Ford N177 | DNQ | - |
| 30 | - | Hans-Joachim Stuck | Shadow-Ford DN8 | DNQ | - |