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		Bart I had exactly the same thing on a LoneStar!  Vibrations would start at around 65-70 and I couldn't "drive through" them. I DID have my alignment done professionally AND I had the wheels fully balanced after I had finished the build. 
 
I agree with Doug about checking your alignment, BUT after 1000 miles of frustrated driving, I finally took the front tires/wheels to have them REBALANCED. The local tire place COMPLETELY screwed THAT up (another story, they had to replace both front tires for free for me!!!!) BUT after the second balancing, the problem has gone away COMPLETELY! 
 
Good luck 
 
Glyn 
		
	
		
		
		
		
		
		
			
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