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Thrust angle is the measurement to tell you if the rear end of the car is squared under the frame. If you have ever seen a car that is going down the road a bit crooked, it could be an out of whack thrust angle. If the thrust angle isn't right on a leaf spring car, you can loosen the U-bolts a bit and try to get the rear end squared up, but that won't do much. If the angle is way out you will need to have the frame checked; it's probably bent.