I have a 9.25 limited slip rear end(rebuilding it) in a 99 ram 1500 4x4 want to use amsoil 75w90 severe gear oil , but am getting mixed up about adding the friction modifier to it or not. I know that there is some already in the oil but it is enough ? will adding one tube of their slip lock modifier(4oz) hurt ? anybody run this stuff in their diffs

 

I used the std mobil 1 rear end oil with fric mod because I read of how sharp turns n "undeveloped" roads can make for a noisy lsd diff.