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The whirring sound is getting louder in my M47. It seems to mostly make the noise when the input shaft turning. It is quiet at a stop with the clutch in. It makes the noise when driving in all forward gears except 4th. I am guessing that this is because the gearbox is 1 to 1 in 4th. What part fails in these gearboxes? Is it possible to replace the part? I know I can swap in an m46, but that would be a real hassle. The overdrive would probably need rebuilding, I'd have to wire the overdrive, new driveshaft, I'd have to fit the ignition sensor etc. I would rather keep the M47 going if I can.
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