Ford Repair Questions? Ask a Mechanic for Answers ASAP
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Since the noise only occurs in third gear, you can exclude everything that comes after the gearbox (differential in the gearbox, rear axle differential and drives).
Such a noise can occur if you try to engage a gear at too high a speed of the shaft in the gearbox. But since it occurs when the gear is engaged, I assume that the synchronizer ring of the 3rd gear does not disengage after the gear is engaged and continues to slip.
To fix this, the gearbox has to be disassembled, disassembled and the synchronizer ring has to be replaced.
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It definitely has something to do with the pressure on the gear wheel. A synchronizer ring should actually howl at higher rpm when the car rolls down the hill. But the fault is to be found in 3rd gear. The gearbox should be checked in any case.
Thanks for your rating, have a nice Sunday.