Royal Purple okay to use in replacing T5 tranny fluid?

Heck yeah

To expand on that Royal Purple is a great high performance lubricant, I have heard nothing but great things from everyone who has used it. I have seen it endorsed by several shows on TV like "horsepower Tv" and "Trucks." When I stop being lazy I will definately use it in my T-5.
 
i've used it many rear ends,trannys, and engines.it works great and helps lower horsepower vehicles more than higher modified ones.don't use it if your t-5 is starting to grind in gears or it'll make it worse,royal purple has even stated this.