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tranny issues 95 sierra

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hey guys, i have a 95 sierra and occasionally when I shift into drive it goes immidiately to 3rd gear and its locked there, doesn't matter how fast I go.. I can get 2nd gear if i select it myself but that's it. This doesn't happen all the time either about 1 in 4 i'd say. I read on another forum that it could be solenoids in the tranny because they have to be energised for 1st and 4th, something about the circuit could just be lose. What do you think about that, or is it something more.

All help is muchly appriciated

thanks

ryan
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