to get the Ford Excursion (or whatever you have) up to 75 only takes about 50 hp in the real world (less in theory). It's just slow. A couple of Netgain Warp 9 motors connected end to end by their shafts (one with the shaft sticking out both ends) ought to do it. Their continuous rated power is like 25 each. But they can put out 3 times that each, for short bursts. Take off from a stop would be better then the Triton v10, but after 15 mph the v10 is better. After 30 mph the 2 electric motors would start to feel like an under powered v6 or a strong 4 cylinder. After 60 mph it's just painfully slow. The DC electric motors like the Netgain are really strong at low rpm, but weaker at high rpm. You really need 4 motors, 2 motors end to end, direct driving each differential. Then you'll be putting out up to 300+ hp with full time 4wd. Then the truck would really move, especially off the line (not as fast as if you used a transmission, but still fast enough). Still a little slow from 50 to 70 though. You really need a better motor then the ones that are available to home builders. For some reason, all the best motors, like the Tesla Motors motor, and the UQM Powerphase 150, are available to OEM manufacturers only. They're both 3 phase AC induction motors. Their low rpm torque is less strong in proportion to their horsepower, but it's still pretty good, and they can rev higher and they have a wider power band. And they're both pretty got dam powerful. You can get 3 phase AC induction motors, like the HPGC AC50, or the Azure Dynamics AC55. But they're not nearly as good as the Tesla motor. They're really no better they their DC cousins. Less low rpm torque but higher reving, equal power to weight ratio, and they're more expensive. Their power does peak out at higher speeds, which is good for that portion of your driving, but not as good for the off the line take offs. They don't have sufficient torque to direct drive the differential, they require a transmission. But if you're using a transmission, the higher rpms don't make a bit of difference, you might as well pay less money for an equally powered, low reving DC motor. The Tesla motor has great low rpm torque and great top end power. That's the motor you want.