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On a 99 chevy z71 the four wheel drive selector buttons lights are on all of them . this affects the transmission shifting. What is the problem?

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Sounds to me like the little electrical motor to shift in 4x4 on front differential is mis reading needs to be replaced.

Posted on Dec 26, 2016

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Best to have the codes read. The only way the T case would affect shifting is if it were locked in 4 wheel low. It would shift fast and not gain much speed. Most times it is the encoder motor on the T case that dies.

Posted on Dec 26, 2016

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