B&M = CRAP!!! NEVER use it!!!! You might as well put Type F in your trans, well if you can even find it anymore lol. I have never been a Royal Purple guy either. I used to use a lot of Valvoline Durablend when it came out and was happy with how it worked but was very hard to find around here. Dexron 3 or 6 is plenty safe for anyone. There isnt much use to spend lots of $$$ on trans fluid and hope it is better than what you had and not really know. Use what works and you will be fine. Again keeping the trans temps in par is more important.
Scotty in responce to the NO OD until 140ish that is incorrect. The pcm will prevent lockup from coming on until the trans hits roughly 110 deg F though most vehicles vary a bit from that anymore but is close to follow. That is why on really cold days you notice the rpms seem to hang kinda high for a while and then drop down.
