Quote: I can ell you from experience that an improperly gear 7 1/4 will not stand up behind a 318.
Are you sure? If we were in court and you were to make that assertion and support it with the evidence you've provided, I would shred you before any judge or jury.
Quote: I recently purchased a 1984 Chrysler 5th Avenue that had a 318 and a 7 1/4 rear axle. Shortly after I purchased the car, the rear end suddenly died on me (and I wasn't abusing it).
Okeh. Nothing to dispute here.
Quote: I think the torque of the 318 combined with the ridiculously high gear ratio combined to kill the rear axle.
Mmm...no, I don't think so. Remember, rear axles with taller ratios (like yours) are stronger than the ones with shorter ratios. With a tall ratio like 2.2, not only is the pinion larger in diameter (therefore stronger) but there are more ring and pinion teeth engaged, thereby reducing the load and strain on every tooth on the ring and the pinion. As for the spider gears, they have no way of knowing what ratio the ring/pinion might be. Me, I think we have no idea how that car was used (abused) and maintained (neglected) in the twenty-six years between late 1983 and when you recently purchased it. How many miles does the car have on it? How often was the rear axle oil changed? What kind of oil was used? How many owners did how many neutral drops, or floored the gas with the back wheels on glare ice just to hear the supersonic whine of the tires and watch the speedo peg? And even if no such abuse took place, let's think about that mileage question again. If we assume the car was driven a rather conservative 9,000 miles per year, it has something like 234,000 miles on it. What is a reasonable lifespan for a rear axle assembly?
(…And how is it that boiling water soaks into a grit in only five minutes on your stove, when it takes the rest of the grit-eating world twenty minutes? Were these magical grits? Did you get them from the same man who sold Jack his beanstalk bean? Do the laws of physics cease to exist on top of your stove?   )
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but it'll be fixed soon
