I have an '02 truck we are trying to get ready to do some sled pulling, and I need to get the transfer case to shift to low range. It's normally a drag truck, but we are going to try out sled pulling. The ECM knows the transmission is in park/neutral (it actually thinks the clutch is depressed), but I guess it isn't sending the signal to the TCCM telling it it is ok to shift because the 4LO button just flashes with no attempt to shift. The truck was swapped to a duraflite and tuned as a manual transmission. I'm hoping maybe someone has fought and figured out this issue and can help me get this thing working. Is there a way to make the TCCM stand alone or otherwise tricked and so it will shift whenever the button is pressed? It shifts from 2HI to 4HI no problem, but it don't change range for anything (no neutral or low). Worse case, we can unbolt the shift motor and use a wrench, but it would be nice to get it working with the switch. Thanks for any help.