I know its been asked a million times, I've searched all over getting mixed reviews on what to use, Alot of old threads on it and some new would like some reassurance I guess. From what I gathered 3.2 quartz is desired to use but, the tough part is Gm synchromesh, royal purple, and or Mobil 1. I looked in the parts store the other day and peeked at the mobil 1 atf but its full synthetic and from what I understand its not good to run full synthetics in the transmission and found a Similar review on the Royal Purple, the Gm stuff I haven't found yet I'm guessing thats a dealership thing for me to grab if I opt for that. Anyways would really like some help on this Thanks in advance.