1.Could someone post the factory drive shaft length for a 70 challenger with a 440 4-speed combo?Also is this measurement taken end to end?Or from center to center on the u-joints?

2.Is it possible to feel a drive shaft vibration in your steering wheel?I have a slight vibration I checked everything in the front end its all tight had all four wheels balanced cant figure out where its coming from.I changed a u-joint last weekend and could push the caps in with my fingers so I know the shaft needs replaced.As always thanks guys