A professional gearbox rebuild can be a good alternative to replacement, especially when the housing and major components are still in good condition. I’d recommend choosing a service provider that offers a thorough inspection, including gears, shafts, bearings, seals, and alignment. Ask whether they use quality replacement parts and follow proper machining and assembly procedures. Load testing and final performance checks are also important before the gearbox is returned to service. It’s worth comparing warranties, turnaround times, and previous experience with similar industrial equipment.