I'm thinking about running Castrol Hypo C 80W-90 in my trans and rear diff in my 85 GSL-SE. Does anyone know if I will have to add an lsd modifier? Bottle says "limited slip performance"

Anyone ever used this stuff?

 

i used it in my 85 SE rear and never had problems. i also used it without the LSD modifier ... BUT ... i don't know if there is a long term effect from not using it (i sold that rear a while ago) ...