Sounds like a good combo.I'm running 40s on my 2dr FE , with the new 5.38 gears and the FP tune, the truck feels FASTER now than with my 37s, 4.7 and no tune.
I was surprised at the performance. These little engines produce ALOT of low end torque. The brakes do seem somewhat softer now tho.
Do keep in mind, a regear (even when keeping tires unchanged) doesn't make a vehicle have better performance across multiple gears. It only bumps in gear acceleration at the expense of shifting sooner and into a lower power rpm range post each shift.
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