[ls1nova71]

I'm going to assume its a GenIII since you have a TAC module. Any way, the way you can check to see if the TCC is working is to drive it, and when you're going above around 45mph at a steady cruise, just lightly step on the brake pedal. Only step on it enough to make the brake lights come on, but not so hard as to actually apply the brakes. You should feel the torque converter unlock, and the engine rpm's will jump up a bit, if you have a tach, you will see it.

As for the cruise, you need to find the wires that went to your original cruise module under the hood. In that plug you will find the same color wires you found under the dash. I would do a continuity test between the wires at the cruise switch plug inside, and the module plug under hood to verify you have the correct wires. The gray wire is "on/off" and goes to the TAC harness pin 14, the dark blue is "set/coast" and goes to pin 4, and the green wire goes to pin 5 "resume/accel". The last wire on the TAC is light blue and is in pin 6, you need to run this wire to the brake light switch, and hook it up to the brake light wiring side of the switch that is hot when the brakes are applied, I believe it will be a white wire. I "think" you will have to run that last wire because the older wasn't wired that way, but not totally sure since I've never had this new of a truck.