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I noticed that you wanted to know the force required to mover the truck.
You can assume that the truck will weigh about 5000 lbs.
30% grade is a reasonable minimum hill climbing capability. So, you will want a tractive force of 1500 lbs. Tires for an S10 can range from 25.5 to 28 inches in diameter. We'll pick 24 for simplicity, because then the radius is one foot. That means that a little more than 1500 lb ft torque is required, (more yet for larger tire sizes). With a 3.43:1 rear end, you'd need 437 lb ft of torque at the input to the rear end.
You need to decide what sort of top speed you want, to see if the gearing for 30% grade climbing will also give you adequate top speed (based upon the motor's max rpm). If not, then you'd need more than one speed in the transmission.
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