hotrod51

iTrader: (1)

Anyone know how to wire the tow/haul function on a 04 6.0 4L80E swap?

76LQ9TA

iTrader: (1)

I think it should just be a switch for the wire to the pcm. It will tell the pcm to use a different set of shift tables. Look at a service manual at the dealer to find which pin on the pcm goes to the switch. The manual I have is from an escalade so it doesn't show this.

stealth71

iTrader: (15)

This has been covered before try a search. You need to temporarily ground a pin on the PCM to switch programs. The PCM must be reprogramed for this functionality first.

stealth71

iTrader: (15)

Ok I found it for you, but search next time.

Dual Tune