1989 IndyCar season Drivers and constructors Drivers and constructors

| Team | Chassis | Engine | Tires | Drivers |
|---|---|---|---|---|
| Newman/Haas Racing | Lola | Chevrolet | Goodyear | Mario Andretti |
| Newman/Haas Racing | Lola | Chevrolet | Goodyear | Michael Andretti |
| Patrick Racing | Penske | Chevrolet | Goodyear | Emerson Fittipaldi |
| Galles Racing | Lola | Chevrolet | Goodyear | Al Unser, Jr. |
| Team Penske | Penske | Chevrolet | Goodyear | Danny Sullivan |
| Team Penske | Penske | Chevrolet | Goodyear | Geoff Brabham |
| Team Penske | Penske | Chevrolet | Goodyear | Rick Mears |
| Team Penske | Penske | Chevrolet | Goodyear | Al Unser |
| Porsche North America | March | Porsche | Goodyear | Teo Fabi |
| Truesports | Lola | Judd | Goodyear | Scott Pruett |
| Kraco Racing | Lola | Cosworth | Goodyear | Bobby Rahal |
| Dick Simon Racing | Lola | Cosworth / Buick | Goodyear | Arie Luyendyk |
| Dick Simon Racing | Lola | Cosworth / Buick | Goodyear | Scott Brayton |