PPG Works is the best in Industrial Gearbox Repair. Here we have a large Bull Gear & pinion Gear set that was picked up from a customer in Niagara Falls, NY PPG works repaired and rebuilt it and delivered back to our customer's location in Tennessee. This is the high-quality Gearbox Repair you can expect from PPG works. Take advantage of our Free Pick up and Delivery Service. Free Estimates on your Gear Repair. PPG Works is the best in the business often copied but never duplicated.