transmission HELP!!!

cassidy574

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i have an 03’ silverado. 5.3l 4l60 with 4WD.
i just put a new trans in. new trans has 50k on it. Converter is seated correctly and bolted in right. Fluid is full and good. Truck starts and runs but won’t shift. On the gauge cluster is doesn’t show what gear you’re in until you shift it and it says neutral and then the light shuts off again. You can manually shift the trans but it won’t move. linkage was adjusted and fine. Help?!?! i do not have the money for another trans as i just bought this one to replace the last that blew 3rd and 4th out of it. i’m running out of what it could be. i also just replaced the Neutral Safety Switch.
 

zora

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I believe it's a 4L60E. Do you have the equipment to run diagnostics on the transmission such as testing shift solenoids? Was the transmission guaranteed?
 
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