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Where is the 1-2 shift solenoid located on a 2008 allison transmission?

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My transmission won't shift into reverse and has a clunk going into drive. Also it feels like it might be taking off in 2nd gear from stopped.
Vehicle: 2008 Chevrolet silverado 6.6 duramax/ allison transmission

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​ The SS1 is in the valve body. No reverse, feels like taking off in 2nd gear, low transmission pressure can cause this condition.

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