A few months back I entered a question on this forum about end-play on the crankshaft thrust bearings for my 87 Ram Chrgr 318. Dodge mechanic said I was triple tolerance on the shaft, frontward and backward, when he replaced a leaking crankshaft seal. That was 7000 miles ago. At that time mechanic said I wouldn't make it another 1000 miles without seizing the thrust bearings. Now I'm not so sure. I'm using a quart of oil every 1200 miles, which I think is pretty good for 323,000 miles without any heavy engine work at all. And, I hear no rattles/knocking from the engine as I accelerate or decelerate. I feel some play in the drive train but believe that's just backlash and not crankshaft-bearing-related. So, question is, shouldn't I have SOME symptoms of worn out thrust bearings before I seize-up on the road??