So, when you're trying to go up a steep grade the front end gets lighter and lighter while the back end gets heavier and heavier. That's why a two wheel drive truck that's really heavily loaded down can still go up a very steep grade. If the grade is steep enough, front wheel drive will have real problems. Consider that most Continental divide highways are no more than 4% grade. And 8% grade is considered a monster. A 22% grade is kind of stupid, but we just didn't have the means to cut a much longer road with switch backs. We ended up pouring concrete on that section because we just couldn't keep gravel on it.Isnt the engine in a fwd weight over the drive wheels ?