transmission problem on 2000 GMC Yukon

I had a new transmission installed in my 2000 Yukon and it is having trouble still shifting into any gear but drive and reverse. Could this be a wiring problem? Or could it be something else?

by in Thurmond, WV on October 27, 2009
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1 answer
ANSWER by , October 27, 2009
It could be the TCM transmission control module or a sensor somewhere i would get the Transmission diagnose with a special scan tool to try to find the problem