I went to the junkyard yesterday. I looked at about 20 different Blazers and S10'* looking for a rare button. Yes, the rare Tow/Haul button. Finally found one.
Got back home, grabbed a spare pin wire and installed it on PIN 71 of the Blue PCM connector, ran it into the cab via the firewall, soldered it to the button, ran the ground wire, cut a hole in the bottom of the headlight switch, installed the button, then I used the laptop and HPTuners to change the Trans Performance mode from Class 2 bus, to 1 switch and voila, I now have the Tow/Haul trans performance installed.
Next week, I get to install my Flowmaster 40 on the truck. Wife got that for me yesterday for my early b-day present(actually, its today).
1997 Pontiac Bonneville SEi-SCRAPYARD
2000 Chevrolet Blazer LT 4X4 4.3L
2002 Chevrolet *-10 LS Ext Cab 4X4 5.7 V8