1987 Ford F-250 Lariat Diesel

I have a 1987 Ford Lariat F-250 It ran and drove GREAT about 2 weeks ago but then one day it didn't want to start it went threw all the gears and 4x4 Worked excellent. 131,000 miles I never took it to mechanic because I don't really want put any more money into it. It has new batteries,fresh oil change,fuel filter,oil filter,air cleaner and electric fuel pump. Down sides are the front tires are kind of chopped, The tailgate wont close,Passenger mirror broke as seen in picture. Also no headlights but i was told its a common problem and only needs a switch. Interior is very rough because there was a trapped in there when the previous owner has it. Has a DMI towing hitch with suspension also has a bed liner. Would be a awesome truck this winter. Please don't hesitate to ask question.