Differential Fluid

From: William H. Hiatt III (william@hiatt.net)
Date: Wed Dec 31 2003 - 20:12:53 EST

I was planning on changing the rear-end fluid out tomorrow on the truck. I know I need the additive but I forgot to pick that up and the dealers are all closed now.
 
If I use synthetic gear lube, do I still need to add the modifier?
 
Thanks,
 
William

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