You can start by checking the trans fuse,see if its blown.from there it could still be a shift solenoid,just because you switched them out of an old trans doesn't mean they cant go bad,it could also be debris/dirt in the valve body.it could be an open or short to ground in ignition feed circuit 1020 (PNK) to the 3-2 SS Valve Assembly.it could be in the VCM. You will need a good scan tool to look at shift data and perform bi-direction tests on the shift solenoids to see if there working,also a trans out of an older vehicle might have been fine until you put it in the vehicle its in now,but could still develop problems.you need to do some testing,if not everything will be a guess.
Please use this guide and these wiring diagrams to check the wiring.
also make sure all of the fuses are good.
Check out the diagrams (Below)
Please let us know what you find.
Images (Click to enlarge)
Wednesday, January 21st, 2009 AT 2:51 PM