1998-2000 GMC Sierra 4.3L, 5.0L, 5.7L and 7.4L Custom Tuning

Black Bear Performance offers three different levels of custom tuning service for your 1998-2000 Classic GMC Sierra. Gains vary widely based on engine size but can vary from 10-15hp on a 4.3L up to 30-35hp on a 7.4L.  From bone stock to heavily modified, we can help your engine perform as optimally as possible. Other improvements range from improved idle smoothness to better automatic AND manual shift performance, improved throttle response and improved mileage in many cases. Additional service offerings include: Speed and Rev Limiter Increase Torque Management Modification/Removal Tire/Gear Change Calibration Accommodation of Most Modifications (Internal engine modifications, superchargers, turbochargers*, upgraded transmissions, etc). *Due to variability in turbocharger systems, they must be evaluated by our tuner prior to committing to any services.  Additional tuning service/hardware may be required.