You got it right, you need to block one end (try wedging a bar crosswise through two of the studs so it rotates into the ground) and put a torque wrench on the other. I don't know what kind of posi these cars had, but if it's a Trak-Lok it should break free at 90 ft/lbs. Other LSDs may be different. One thing - they say in order to get an accurate reading you should use a beam-type wrench instead of one of the clicking kind, although I doubt you care too much about accuracy as long as the diff breaks away above a certain level.
Darel
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'61 T-Bird POS
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