Check this link out.
It may shed some light on this subject.
I spoke personally to Tremec about Royal Purple and other types of fluids that are used in their transmissions. http://forums.stangnet.com/showthread.php?t=737563
Think it's a 97 but might be a 96 mystic cobra with 3" o/r X paid to be fabricated by Valvoline. He had a 3" o/r H on it before hand, they wanted an X. They would have used his car for the audio and visual, but they said the color of the car might confuse the viewer. Had a red Cobra come in revving the thing over and over, filming the throttle cable and revs to match the simple 20 second clip by the mystic
Think it's a 97 but might be a 96 mystic cobra with 3" o/r X paid to be fabricated by Valvoline. He had a 3" o/r H on it before hand, they wanted an X. They would have used his car for the audio and visual, but they said the color of the car might confuse the viewer. Had a red Cobra come in revving the thing over and over, filming the throttle cable and revs to match the simple 20 second clip by the mystic
I've got 195,000 miles on my T-45...it's had Royal Purple Syncromesh since about 40,000 miles...no grinds, funny noises or issues yet (other than the hard to get into R once in a while that all T-45s have)