LS1T56FTW

iTrader: (3)

Now I know stock these transmissions took Dex 3. I also know that Dex 6 is supposed to be 100% usable with Dex 3, so therefore poses the question on which to use, which is better, etc. Also, I was told something along the lines of a synchro-mesh additive you can put in these transmissions? Thanks for any help!