4l80e and 6.0 swap out of a 02 2500 silverado. Harness and trans from the same vehicle. I have replaced the internal harness(leaking from connector) filter, fluid, manifold pressure switch and vss/iss sensors. I have a solenoid kit but I can make all of the solenoids click through vcm scanner. I can also drive the truck in D, and command 4th through special functions and it works fine. Goes through all other gears fine and has no running issues. I have a solenoid kit I can replace all of mine with, but thought it may be a waste since I can hear them all working, as well as both the 1-2 and 2-3 working when I command 4th. The pcm knows what gear it's in and everything. Tps values look normal, and the engine and trans coolant Temps look normal to me. Anybody else got any ideas? I'll post a log file where I drove it and commanded 4th, later today when I get home. Thanks in advance for any help