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					Originally Posted by  Diesel911
					 
				 
				The Centering Pin on each end of the Drive Shaft stick into the Centering Bearing more then one inch. Hercules claims with enough force you can move the shaft that much and get it apart because he has more experience. 
 
If I have to do work on mine I am going to continue to loosen the Coupling Nut and collapse the drive shaft so I don't have to force it to get clearance to get it apart. But, that is my personal choice. 
			
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I was concerned  more with the aspect. If the coupling nut has to be loose somewhat to get rid of a vibration. Where I thought by design the spline that allows length adjustments.Was just to cover manufactures parts tollerances. 
It almost sounds to me that the poster with the issue somehow had the driveshaft a little longer than it should have been somehow. When he initially locked it down. This might occur if you were using your wrenches to tighten the coupling with a vertical force component. The tightning force is perhaps applied better in a hoizontal direction. 
Pre lockdown the spline slide should be pretty free moving. As for removal of the driveshaft I have always used the reduction of length approach. 
The only thing to be said for what the poster of not using the slip ability did.  The past driveline length is preserved. It just sounds like a royal pain to deal with the Driveshaft in that fashion.