Just got my 2016 JK Unlimited. Added TeraFlex 6" lift, chromoly axles, 4.88 gears, Evo Axle Trusses, Fox Reservoir Shocks, 37" Mickey Thompson Baja MTZ Tires and a RIPP Supercharger. All installed great but auto tranny all screwed up even after setting the gearing and tire size with Diablo Tuner. Would not shift 3-4 gear most of the time. You had to "lift to shift" as most of the posts say. If you jumped on it to 3/4 throttle 3rd, 4th and overdrive would not shift. Really disappointing when you spend $6800 plus labor to install RIPP Supercharge and vehicle won't shift and renders Supercharge useless. Enter OST Dyno. I viewed many threads on this and contacted OST. Mike said he could fix and did!! My mechanic was skeptical and called me to ask what I thought this newly programmed TCM was going to do and I answered, "Nothing". The mechanic said works perfectly!!! Totally changed the shift points of first and second and has been shifting 3rd, 4th and OD flawlessly. I have put the pedal to the metal and it reacts perfectly. Thanks Mike! If you are fighting this issue I suggest visiting OSTdyno.com. The OST Dyno TCM reprogramming is approximately $600 including core charge. When you ship stock TCM back to OST Dyno they refund the $300 core charge. Well worth it!