I HAVE AN 89 CHEVY K1500 4X4. 350 WITH 700 R4 TRANS.TRUCK SAT FOR ABOUT 4 1/2 YEARS WITH BAD MOTOR.CHANGED MOTOR. sTARTED RUNNING. AND TRANS NEVER SHIFTS OUT OF FIRST.cHANGED FLUID AND FILTER BEFORE RUNNING.WAS WONDERING IF IT COULD BE BAD SHIFT SOLENOIDS.WHEN i CHANGED FLUID PAN WAS CLEAN.ANY SUGGESTIONS.