Originally Posted by dirtracer1
however, grease on your grears will add friction and do nothing more than gum up your tranny. if you want a free tranny, do not put anything on your tranny gears.....
You are confusing friction for drag, which are completely different.
Lubricating the gears will reduce friction and heat buildup between the meshing gears, so making the gearbox more efficient overall, even if it does reduce the amount of free spin.
Remember free spin does not automatically mean efficiency.
Having also been involved with various "self lubricating" materials (including gear plastics) over the years I can tell you that it is a bit of a incorrect label - the materials do not actually lubricate themselves - it is more correct to say that the materials they are made from are more resiliant to heat and friction build-up, so therefore don't specifically NEED any lubricant to function normally.
However testing has always proven that these "self lubricating" gears still show higher efficiency when some lubricant is used.