I think He was recently running a 4.11 and said he was having major traction problems as I could imagine. A 350z has a 3.54, and if it can move as quick as it does bone stock, then I can only imagine what it would be like in an S30 that's about 1000lbs lighter with a 3.9 or 4.11? Imo 3.9, or 4.11 isn't needed unless he plans on towing a boat. The gearing from the transmission is already pretty aggressive and running a 3.54 or lower would most likely utilize the engines full potential, as I would assume emwhyrohen ran through those gears too quickly with the 4.11....but what Im trying to say is, isn't rotational output important?