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It's internal. May be better to look for new trany 0785 is 2 codes in one. 1st is 2 - 3 solenoid and the 2nd is 3 - 2 solenoid. Either replace them both or spend $80.00 on a diagnostic scan. Each solenoid is $35.00. and easy to replace. Check with a good trany shop and they can tell you witch solenoid to replace.

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Q: How do you change transmission shift solenoid on 2004 Chevy Express code 0785?
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