[mlambrecht82]

The royal purple fluid is the exact same as the type f fluid with a purple color. Be careful that this fluid is compatable with your thrust bearings. An aluminum driveshaft might help a little. the 18% is through the drivetrain not just the tranny (I think) The lighter drive shaft will be less rotational weight and you might feel a difference. I would upgrade the rear end before messing with the tranny. Maybe some high performance bearings and lighter oil? While your at it, through some new gears in there, they won't improve your effeciency but it will rev faster.