1989 IndyCar season Drivers and constructors Drivers and constructors

| Team | Chassis | Engine | Tires | Drivers |
|---|---|---|---|---|
| Mann Motorsports | Lola | Buick | Goodyear | John Paul, Jr. |
| Mann Motorsports | Lola | Buick | Goodyear | Mark Dismore |
| Stoops Freightliner | Lola | Cosworth | Goodyear | Johnny Rutherford |
| Stoops Freightliner | Lola | Cosworth | Goodyear | Steve Butler |
| U.S. Engineering | Lola | Cosworth | Goodyear | Scott Harrington |
| U.S. Engineering | Lola | Cosworth | Goodyear | Phil Krueger |
| Team Lazier | March | Cosworth | Goodyear | Buddy Lazier |
| Curb Racing | March | Cosworth | Goodyear | Rocky Moran |