Good one! Not very often we read perfect, more often a compromise. I have the 0.64 as well. My 3.73 rear gear made for torturous highway driving, especially when I had the 40 series flowmasters and dumps, the 0.64 gear made highway driving a pleasure. I'd like to swap out the 373 for 355, with the Tremec's high ratio first gear I don't even use it, I start out in second except uphill. Your engine combo should have plenty of torque for the gear.
