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At work we have 8 newer F 350 and F 450 6 of them have LS rear ends. The mechanic before me use synthetic gear lube with the additive and all the trucks would chatter bad taking turns. I took them all apart and cleaned the clutches and used plane Jane gear lube 80W90 with the posi additive. All the trucks are happy now.
 

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I thought you were supposed to use syn. gear lube w/o the friction modifier added. It is supposed to slip enough by itself.
 

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I just bought a new 31 spline posi from US gear and they dont want you to use sythetic with their posi`s. regular hypoid gear oil with ford friction modifier.
 
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