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Why might a transmission not shift?

Updated: 8/16/2019
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14y ago

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what type of transmission? for 4L60E trans, try changing the A & B solenoid before giving up on ur current trans, these are located in the pan, they are black and sit side by side, a spring clip holds them in place. cost bout $50 AnswerIf it has a modulator valve gone bad - this will prevent it from shifting. Call Auto zone and ask if there is this type of valve for your transmission.

Check the fluid level. Check for trouble codes with a scanner, Check shift linkage/vaccum lines.

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Q: Why might a transmission not shift?
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