I had posted this on The NLOC and the So cal Lo, but I still am searching for answers. I have an 04L and I bought a superchip micro tunner. When I installed it the OD light kept flashing so I called Superchips and they had me return my truck to stock settings and send it back to them. :smt010 Three weeks later I got it back. Still the same thing, The overdrive light keeps flashing. Truck ran strong and tranny shifted great as expected. I sent it back to them again and still waitng on the return. Has any body had this kind of problem with their micro tunner or any other chip down load that effected the transmission OD light.