Trans issue again

Bad timming

New member
Nov 14, 2020
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Hay there i owen a 2004 chevy silverado 2500 hd 6.6 duramax and i put a trans from a 2002 GMC Sierra 2500 hd 6.6 duramax and got it all hooked up and flushed my cooler and lines and put new filters in and seals and started it check engine turned on right away i checked the codes and got the p0700, p0872 and p2810 and was wondering if it doesnt have a g solinoid witch i have not checked yet but if not could i take the tcm from the GMC and put it in rhe chevy i am not sure if thats possible but was hoping to do that since it more than likely already doesnt have that g solinoid program in it or should i just put the harness from my chevy trans into the gmc and tie the solinoid someplace or swap the whole valve body any ideas or other possible things to try before opening the trans again
 

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