A whining gearbox at highway speeds in a Ford Transit IV usually means a worn bearing or low oil. Here’s what to check first and when to stop driving.
If your Ford Transit IV starts humming or whining from the gearbox once you reach highway speed, don't panic — but don't ignore it either. In my years working on these vans, that sound almost always points to something inside the transmission that's getting tired, usually a bearing or the oil level being too low. At 60-70 mph, the gearbox is spinning fast, and any little roughness becomes a steady, audible note that can drive you mad.
