wont start

What is your question?

drove my D to town been having shifting issues, replaced some parts in tranny doing ok shifting but got to my husbands work because smelt something hot/burning like when we put new muffler on and truck just died hasn't started since turns over but nothing no gauges work odometer flashes 4 times then get "no bus" thought was the PCM replaced it w rebuilt/programmed one and still nothing. Was a great vehicle until this past year and now seems to just be going to shit has 188000 miles on it. Still not sure the tranny problem is fixed for sure.