87 Gmc 1/2 ton Unsure motor miles Unsure tranny miles 700r4 350 TBI Stock front/rear 31's on 15-6lug Spicer hubs Had this truck about 2 weeks now. Begun general swapping of trans/oil fluid. Everything seems to run fine. Here's some things I know though... oil pressure gauge is wacky(pegs and drops and in between); hubs have rusty water caome out when I too them off to inspect; coolant temp sensor is broke; no a/c; otherwise things look normal for age truck. I have about $300 i want to spend on the truck. Tires may be a good option; but maintaining the 4wd, engine, and trans are first on the list. So, if you had $300 to spend, what would be the first things it would/should go for. Btw previous owner seemed to not spend much time keeping the vehicle up. Maybe he did; but not sure.