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Re: GM: '93 H, 4T60E, Code 39, loses 4th gear and TCC intermittently
Posted to Transmission Forum on 12/6/1997

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Do you mean when he commands 4th gear from the MT and gets an upshift, when the PCM is saying it's also trying to ? If this was the case it should have set a DTC 56 (QDM B). If not I would still be su... Login to read more.