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Metal on metal grinding noise from gearbox ?

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I've recently had problems with my gearbox always wanting to be in the wrong gear, and suffered fuel economy loss as a result. I've had the gearbox reset (Star)and software updated which made no difference.

After reading quite a few websites I think the torque converter is locking up, but yesterday it started to make a metal on metal noise, sounds awful and is audible at all speeds and is still there when coasting in neutral....any ideas folks?

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