What I am getting is that you are a s320 right? You will have high gears like 3.57 or 3.75 or something in that range. There are a few options for this. You cannot put a quaife in with those gear ratios. I am not sure that my unit would work for you either as I do not know if the case is the same etc. It could be done but you might need axles and a driveshaft. I just do not know for sure. Also the 3.06 ratio would really bring the accleration down. If you are boosted, which I think you are this might help though with the ratios being down from the 3.7-- range. If you have the 722.5 transmission be careful with running a lot of power throught that thing.