Rickking,I purchased a "rebuilt" ECM for my 93D350 last year from my local NAPA parts outlet. Cost was 200+ exchange. Also had a similar no OD problem with my truck,the solenoid in the trans went bad. Good Luck. Rick.
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93D350,K+N,B+M deep pan,trans-go shift kit Banks pyro+boost+oil temp gauges,dual batteries. 14cm banks turbo housing,pw injectors next.