8 3/4 housing U-bolt torque

69_340_GTS said

Make sure the weight of the car is on the axle before you torque the nuts to 40 ft.-lbs.

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If the reason the torque spec is only 40 lbs is to let the leaves slide, why does it matter if the weight is on the axle when you torque them? Won't the leaves still slide at 40?