After much thought,I will go with the 3.55 ratio. The 3.73s would be useless at the track without Drag radials,3.55 too for that matter,plus I really don't intend to be running this one on the strip anymore. I like cruising the country roads in 4th,at about 50 MPH,about max here with the curves,and county cops,and this would be ideal RPMs for that. It is just a good all around street gear.On the open highway,75 MPH wouldn't be that revvy either.