Tremec 3550

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I'd call Tremec or one of the reputable tranny shops. Bob Hanlon went through my TKO500 and his recommendation was either Synchromesh or Redline also makes a high load resistant oil, I'll have to look for the number of it.
 
Here is the official word from Tremec I just got off the phone w/ them.

The Royal purple is not recommended but only b/c they have not tested w/ it yet. not that it wont work with it. They said the GM Synchromesh, Mobil 1 are fine and also Pennzoil which is who makes the GM Synchromesh.
 
i think royal purple is just tryin to sell you a product :D LOL

I asked Tremec :D

Funny how the Tech on the phone said it will not work but the e-mail I got said it would. I dont see why Royal Purple would make a tranny fluid that would not work with a wide range of transmissions. Just b/c they have not tested it does not mean it's not good for it.