The diablosport tuner I got has transmission shift point tuning. I can't speak for any older units, but this unit does turn off DoD as well. It's worth a shot as I can use it for other things as well.
Edit: I got the tuner they sell with the kit.
This kit includes everything needed to delete AFM/DOD (Active Fuel Management) from 2007 - 2013 GM 5.3L truck/suv engines. Kit includes a Diablosport Handheld tuner capable of turning off AFM/DOD (full feature list below) 12689035 Single Bolt Cam for use w/ OEM Valve Springs - works with or...
www.amsracing.net
I've read that it actually just installs a stock tune with DoD disabled on the diablosport forums.