I think what crispdollaz is saying is : given the two engines specified, were put into cars with identical ratioed diffs, and if both have a gearboxes with ratios which meant that at max rpm both cars had the same velocity, the forces the diffs would see would be identicall, because the high revving motor would need to be have a large reduction in speed. this large reduction increases the torque at the tailshaft.

the only time more torque is true...is if both engines have gearboxes with equal gear ratios.