However, there *might* be some confusion stemming from a few possibilities:
* Overdrive Off: Many automatics from that era had an "OD OFF" (Overdrive Off) button. This button would prevent the transmission from shifting into its highest gear (overdrive), resulting in lower gears being used at higher speeds. This would give a slightly firmer feel and potentially slightly better acceleration, but at the cost of higher RPMs and lower fuel economy. This is probably the closest thing to a "performance" button in that era's Firebird.
* Winter Mode (if equipped): Some vehicles had a winter mode button, which altered shift points for improved traction on slippery surfaces. This isn't directly a performance button but could be misinterpreted as one.
* Aftermarket additions: It's *possible* that someone added an aftermarket performance controller or chip which *does* have a button to activate a performance setting. This wouldn't be a factory feature.
To know what button you're dealing with, you need to provide more information, such as:
* The exact location of the button: Where is it located in the car?
* The label on the button (if any): What does it say?
* The effect pressing the button has: What changes when you press it? (e.g., shift points, engine RPM, etc.)
With more details, it will be possible to identify the button's function.
