A repair typically addresses a single failed component – a bearing, seal, or coupling that has worn out or failed. An overhaul involves fully disassembling the gearbox, inspecting every internal component, and rebuilding it to manufacturer specifications. If your gearbox is showing signs of excessive heat, unusual noise, vibration, or oil contamination, a full overhaul is usually the right call – a repair alone may fix the symptom without addressing the underlying cause. At T&M Mechanical Millwrights we inspect and diagnose before recommending anything, so you only pay for what your equipment actually needs.