Go with the transgo kit. I have heard of problems with the bullydog kit. That is just personal preference though. They are about the same price anyway. If you are just at stock power levels it is good. It might help you hold a little extra power too. I don't know the real world numbers since I haven't done anything to my tranny yet. I am just going to save up for the full upgrade so I can go a little crazy with power.
2016 GMC Sierra 2500HD Denali
Extang Blackmax Tonneau
Weathertech floor mats and mud flaps
X-pel clear bra
295/60-20 Toyo Open Country A/T II
SOLD 2004 GMC Sierra LB7