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gm changed the 4l60 on the 2009 certain silverado trucks 6speed .. so the original factory is 4l60 .. the transmission you stated the slippage on the failure.. put in a transmission additive that cleans up the muck .. then run it a 100 miles then drop the pan and replace the fluid dexron VI and see if the filter has some mess .. clean up the pan area and change the fluid ............ solenoids do stick because of the dirty / wear fluid .
 
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