1991 GMC Suburban 2500 Questions

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There is a little black box it sticks out in the engine bay that gets hot I think that is a problem I do not know the vehicle will not start after running for a while!
a engine quit runing wait about ten minutes engine start i was towing a trailer the engine just stop runing wait about ten minutes it star running again drive about one hundred miles it stop running again wait about t...
transmission shifts through first, second & into third then stays in third. i am wondering if this could be related to towing. i have owned this vehicle for 170,000 out of it's 230,000 miles & only just recently towed...
air bubbles back through coolant resevoir constantly pushing coolant into the reservoir & not allowing it back into cooling system thus causing "low coolant" light to come on.this happened after an overheating episode...
i have can you tell if its your brake boost thats gone bad or your master cylinder
i have a solid axel 8 lug front. replacing ball joints on driver side. how do i pull the axel to get to the ball joints?