where'd you hear this? i'm using redline on my tranny right now. it's worked wonders for me. you kinda getting me worried!!! should i switch? i'm using the redline lsd gear oil for my tranny...send me the link with the findings you got.nyoneway said:Redline is as good as Royal Purple. The reason I'm switching is because I'm getting a LSD and the best Redline fluid for the LSD is corrosive to our bronze/copper synchros but Royal Purple are safer.