A lot of things. The water pump blew out when I first bought it. Valve cover gaskets were next to go. Radiator went out, Brake line blew. Fuel tank replaced as well as the fuel sending unit.I'll tell ya this it was good truck and it served it's purpose.I'll miss it.
This truck is dependable if you put money into it. When I say money I mean lots of it.
I hear you about lots of money required to sustain the B2. I got mine for $5K and just my repairs added up to over $10K,...engine, transmission for starters, lost count on the other problems. I retired it when the second engine could no longer run on bars leaks... it had a cracked head.