if you go 3.7 i dont think it will work, there are coil drivers in your computer that go to each ignition coil I.e. 1-8, then theres ABS hubs and Auto/man trans blah blah blah. i bought a used computer weeks ago with matching numbers, for me it was 737AC. it got my truck to run but the ABS light stays flashing. also with it being a used ECM it has a short in it somewhere. truck runs about 30-45 minutes until it gets good and warm and the power shorts and the ECM shuts down. My best advice is instead of buying a hundred dollar used one like i did and still have a dead truck, go ahead and check ebay for reman/repaired ECM's. Flashmasters is who im going to buy mine from. under 200 bucks and you send them your VIN and its a better insurance rather than to waste money on something that is probably bad or will just cause problems shortly down the road.
Take the truck and get it hooked up to a scanner, if it doesnt even turn the scanner on or the scanner cuts out it is probably losing power and gone bad.
i took my truck yesterday to a shop and paid 35 bucks to basically ******** with the mechanic until it started shutting off on its own, he had his computer plugged in the whole time and when the motor died all the accessories stayed on, did not lose power to anywhere else but the ECM. I've got a wiring diagram of the pin out for all the plugs going into the computer that the Flashmasters guy sent me so i could get voltage readings and possibly track down grounds that could be bad or maybe a hotwire pinched off or something, but i have to decode the wire color codes.
