3.55 is roughly 10% lower (higher numerically), so I would think 3.55's would drop theoretical top speed about 10% from 3.23's. I.e., low 130's with 3.55. Am I miscalculating?
BTW, I have estimated the actual top speed of Dad's hemi (now mine) at just over 140 with 3.23 gears. How close that is, don't know. There are formulas, but it's hard to accurately figure torque convertor slip and tire growth, and just a small percentage difference can easily be worth several mph. Anyway, it has 4.10 gears now, so much lower top speed. I did once see 6100 rpm in my 65 340 Barracuda, 4-speed, 3.23 gears while drafting a 308 Ferrari. Again, long time ago. Have slowed down a bit in my old age.
