Differential oil, do I need posi additive? - Third Generation F-Body Message Boards

83ho86tpi · 06-04-2004, 10:37 PM

Here is a pic of my differential. It is posi or limited slip or whatever, early 3rd gen 7.5 type 3.73 rear end. I got Lucas high performance 80/90 plus gear oil. The oil says its excellent for use in limited slip differentials and no special additive is needed. I bought a tube of K&W posi rear additive thinking I needed it. Do I need to put this in? I dont want to mess anything up by putting or not putting the additive in.
Thanks

DoBeR · 06-04-2004, 10:51 PM

If it already has friction modifiers in it than you shouldnt need to use the additive. I bought some redline performance gear oil and it already comes with it so I dont need to add anything.

SSC · 06-05-2004, 12:54 PM

No additive needed, thats a grenade lock anyway, additives dont do much good. I had one in my 85, it lasted maybe a month.