I really thought that my book specified only 8 oz. but I could be wrong. I need to check that because it could be the problem. I used K&W, so I dont even know if it is for GM or Ford or both. Threw away the tube. I think my Valvoline oil said the same thing: for conventional and limited slip axles. I'll have to check around on this one I guess.

Thanks,

Edit: The only thing I can find is that they recommend 8 oz. friction modifier. And the oil does say it is for all hypoid applications (conventional or limited slip). Now I just need to find exactly what that K&W stuff is made for.