* Specific Model: Is it a Silverado, Tahoe, Suburban, or another model? Each has different gearing, aerodynamics, and weight.
* Transmission: The type of transmission (automatic or manual, and the gear ratios within) significantly impacts top speed.
* Modifications: Any performance modifications (intake, exhaust, tuning) will affect the top speed.
* Conditions: Road conditions, incline, wind resistance, and even tire pressure all play a role.
While a 5.3L engine is capable of reasonably high speeds, manufacturers typically limit top speed electronically to protect the vehicle and its components. You're unlikely to find a factory-stock 2015 Chevy with a 5.3L engine that's capable of speeds over 110-120 mph, and even reaching that speed would be dangerous and irresponsible. Trying to achieve the absolute maximum speed is not recommended due to safety concerns.
