The gas tank bit the dust the first day I had it, and anything over 18 gallons causes the vehicle to reek of gasoline inside and out. Anything over 19.5 gallons will run out of the car, and can actually cause the gas pump to keep pumping gas well over the capacity of the tank. Personally, I think it likes stickin' it to the man.
The third or forth week I had it, I closed the tailgate up with the spare tire, and was treated to a very untimely demise of my back window, as it went to pieces. Poor Blazer got confused -- all it wanted to do was keep up with Broncos.
At 163,000 miles the ZR2 suspension collapsed, causing the vehicle to drop a good two inches. It's since been replaced, but with all the lowered cars in my area, I think that my Blazer was jealous and just wanted to fit in.
Intake manifold blew at 169,000 while I was accelerating onto the highway. Luckily, this vehicle is equipped with a "Check Gauges" light, which alerted me as it heated up quickly, and gave me time to pull over, thus avoiding a considerably more expensive repair on the truck. I think it was its way of forcing me to do a coolant flush.
Gas gauge has always been a little off since I purchased the vehicle, and at 172,999 it finally crapped out -- dropping from 1/4 of a tank to empty and shutting off the vehicle while I was doing 65 on the freeway -- currently, if I fill the vehicle with my standard 18 gallons of gas, I'll go about 100 miles before it's on E again. Mileage counting has, however, helped me improve upon my math.
As I reached 173,400 the steering wheel lock and shift-interlock on the transmission have decided they are sick, and only show up to work occasionally. My vehicle now starts without a key, shifts gears without the brake pedal being pressed, and the steering wheel no longer locks. Good news -- I can't go from D to R while moving, so my safety is one of it's concerns.