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      07-30-2010, 09:01 AM   #26
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Drives: E30 M3; Expedition
Join Date: Apr 2007
Location: USA

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Originally Posted by swamp2 View Post
Ha, always the engineer thinking!

-I like the ratchets for convenience (own ratchet style now)
-Sometime there is not quite enough adjustability in them (same would probably be true of the through pin design)

If you run some really quick back of the envelope calculations on the jacks, either design, you will find pretty large safety factors. Probably at least 3, perhaps even 5. I know the feeling though... There is such little room under the car and I question the jack and stands every time I slide myself under.
Yes, one would think the would employ high safety factors in the design of a structural component such as this one, but I also worry about manufacturing defects when I see them for $20 at Sears, etc. I assume the shafts with teeth are cast. But I guess if a teeth sheers off, another one down the shaft can engage. Anyway, I guess I should just pay up for the peace of mind...