Type F atf has been used for many years in 2-stroke transmissions with fantastic success.
It provides a very positive shift, which is required for both racers, and rough terrain riders.
It is very stable, compared to other fluids, in high heat applications such as two stroke racing can create. I think most Type F's have a flash point ~570F.
Another definate plus for Type F is the performance in cold weather. Using just about any OEM recommended oil, you will find that when the weather is cold, the bike wants to lurch forward, even with the clutch held in. This situation does not exist when using Type F.
Off road riders often times will just start riding lots,when the road guys are mothballing their ride for the winter.
I realize that there is lots of contaminants that show on a two-stroke gearbox analysis..no matter what fluid you use. My first question to the analysis man would be..how long was the oil used?
Oil change frequency with motorcycles is far more than that of an automobile, and even more frequent for a 2-stroke application.
I have never experienced any abnormal gearbox noise using Type F, and I have used several different Type F's over the years, including Valvoline Type FA.
At ~.79 qt. it is very hard to beat this product for the hydrostatic transission of a two-stroke motorcycle.
It is LOADED with barrier add.
Never use highly friction modified Dexron or Mercon type fluids in the 2-stroke...
Type F has a dynamic coefficient of friction that is reduced when the revs are high, which is exactly opposite of how Dexron/Mercon type fluids work.
I suppose some analysis is in order for some comparative data.
(as an afterthought...) Those who have experimented with Dexron or Mercon type fluids in the 2-stroke gearbox, and switch over to type F after recommendations, will probably find no differnce at all. Quite possibly your plates are already glazed from the modified fluids.