I'm planning out a L92/ 6L90e swap into a 2004 GMC Sierra 2500hd. I will be using an E67 to retain the class 2 data needed for the truck while supplying the CAN needed for the TCM. Does the E67 work correctly to pass along the class 2 tow haul request onto CAN to the TCM? It doesn't look like the Colorado or Trailblazers had a tow haul mode, so it's not clear to me if the e67 will convert the class 2 tow haul into CAN.
On a side note, my plan for the cluster gear indicator would be to change to an 06 style so that the indicators are LEDs and not on a VFD. I'm assuming that the PRND indicators will light up the same, but what happens when the truck is shifted into M or 1? Will 3 be lit for M and 2 lit for 1 or will the indicator just go blank?