When your gearbox starts giving trouble, it can be difficult to know whether a repair or full replacement is the right call. The answer depends on the type and extent of damage — and getting an expert diagnosis early can make a major difference in cost. Common Signs of Gearbox Problems Some symptoms are easier to spot than others. Watch out for: grinding or whining noises when shifting, difficulty engaging gears, gear slipping, a burning smell, or transmission fluid leaks und