Will run fine until 30 to 35 mph then all systems go out!

Cant say I have ever heard of that befor. Does it just bam shut off like you turned the key or does it kinda bog out or stall out.

No it just quits like the switch was shut off. No stalling or notta, just bam its dead and coasting.

Ok is there still power to other items IE Dash lights, Stereo, AC fan

Yes but b4 I can get it started again I have to shut the switch off wait about 30 seconds and then it fires. Btw It will idle as long as I leave it running.

Puzzling one indeed. Curious what sensors did you replace and codes that pop'ed up. Seems to me like seems pretty obvious do to with the electrical. Did it have this problem before the sensors were replaced or replaced due to the problem. Im asking alot of question and not offering much help hopefully we can get some were here

Engine coolant temp sensor, code and replace, vehicle speed sensor, code and replace. This may help, reverse is not working, tries to catch but will not move could it be a sensor inside the tranny?