ok yes you can remove the front shaft, but like said above everything in the front axle will still be spinning so it wont save you much if anything. yes you can run on just the front shaft but i wouldnt advise it its half the size of the rear so theres a good chance it would twist, and also it drives real funny wanna talk about torque steer, i had to do it for a day when my wifes rear ujoint on her v8 explorer was vibrating too hell, it took nothing to light it up and it just drifted where i pointed, but still no saving on gas since everything in the rear axle will still be spinning