No, the tranny is coming out, the Belleville spring is inside the rear clutch....It is what pushes the piston back in causing the clutch to release..Another possiblity is you mention the car bottomed out on the road to the racnh..Is there any new dents in the trany pan? it's possible the valve body took a good hit & now a valve is stuck...If theres no dent then your back to the Belleville spring...