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I have a 2004 Ford Explorer 4.0L the overdrive light started flashing and the transmission suddenly started shifting erratically high rpm and then slamming into gear, sometime I have to rev the engine to 3000 rpm to get it to accelerate out of drive. he check engine came on I'm getting P0720 output speed sensor circuit. I replaced sensor twice and still having the same issue. I noticed the harness looks corroded and I'm thinking this might be causing the issue. I had a shop tell me just replace the whole transmission for $2200 but I think it may be some kind of electrical problem any opinions or advice would be greatly appreciated I dont want to spend that much for something that could be a potentially easy fix. Thanks
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