I don't know what is up but the tranny is acting up. It is shifting twice as hard than it used too from 1-2 then it will shift immediately into third from second. Also the the 1-2 shifts immediately on light acceleration and on heavy accel. it does not shift soon enough the rpms get high. The 3-4 shift is normal but in highway speeds from 70-80 when I let off the gas the tranny feels like it is braking the truck. The OD light is not flashing and works fine also. Anybody want to guess the problem?