TC Lockup is a switch you can put in so you can lock up your Torque Converter on the fly, helps lover tranny temps and put out some more power to the ground. If you search for it in the threads youll find a bunch of write ups on this mod and some great detailed directions. CCV Mod is the Crank Case Vent mod, basically keeps the engine compartment/ IC Boots, anythign under the hood a lot cleaner because it routes the oily gasses emitted out of the air intake into the atmosphere, again, some great write ups on the org, and the 10k mod has to do with a resistor. Some say its not worth it because if you get a chip/programmer you wont notice any difference and it has been known to make the truck idle a bit rough. Gauges and a chip/programmer are deffinitly some thigns you should look into to really wake up the 7.3......good luck!