Hi all, I'm sitting here and wits end. Tranny went out on the envoy so got a new one and installed it. Put a new nuetral safety back up switch. It started ran great took for a test drive ev er everything was fine. Said to my wife here take it for a spin im sure you forgot what 2nd gear was like. She got in went to put into gear it died, would only crank over and over wouldn't start back up. So made some calls to a couple of master techs I know ( ofcourse they live in different states so cant come and help directly) for any advice. They all came to the conclusion that fuel pump went out, so with much reluctance i dropped tank and switched pump. And also i hooked pumps up directly to battery both old and new work flawlessly. So now it has a new tranny and fuel pump but no juice to pump. So next suggestion was ignition switch, well needless to say has a new ignition switch also. So I thought well dang maybe the nuetral safety switch was bad from manufacturer , nope has another new nuetral safety switch. It would just crank and crank no start. I got another preprogrammed CPU installed now it has a new CPU. Then I noticed that pcm 1 fuse was blown replaced, still nothing and fuse isnt blowing anymore. And now I have no cluster lights except for battery and gear shift indicator eliminates but is locked in park. Also the power windows dont work but yet blower fan and hazards and light come on.( but not with key but with switch on dash.also I lost all power to ignition. if I jump starter relay it turns over good if I shoot a little starting fluid into throttle body it will almost catch and start, I followed harness from CPU to fuel pump can't find any broken wires and every ground I found is in great shape. Over the last 2 years everything on this vehicle besides pistons rod and main bearings has been replaced she loves this truck more than me. Lol. Looking for any help on something I might have missed or has had this situation before. Oh yeah and to add I'm nothing getting power to back half of fuse box except for starter relay, pcm #28 fuse isnt getting power anymore. Thanks to all that can help.