It's just a way to manually lock the TC. I don't really use it much since I got the phoenix chip. It used to be that the truck would downshift and there would be no power going to the wheels because the TC would just spin forever - creating excess heat and robbing the power to the wheels. So I would lock the TC manually with the switch to override what the stock programming was telling it to do. Now, with the pheonix tow tunes, the TC locks up more quickly when the truck downshifts and I don't use the manual lockup any more.
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Bob-
2003 F250 Lariat 7.3PSD CC SB FX4
Kwik (6637) Filter, RE 2.5" leveling kit, F350 Rear Blocks, TC Lock, Fumoto, EBPV/Exhaust Brake,6.0 Tranny Cooler, AIH Delete, IssPro EV2 Gauges, PHP Phoenix stock, 25tow, 40tow, 65tow, 80dd, 100perf, In-tank mods, Muffler Delete, WW, FRx,HPx, JW Stage 1 Trans, Swamps HV/HF IDM
-Pulling a 38' Forest River Sierra 5th Wheel
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