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			#1  
			
			
			
			
			
		 
		
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			As for the time frame differentiation, remember there was the initail order to run the parts; I can imagine the parts ready for the COPO order call, being that this was accepted internally before the run of the orders to be filled...so to have the surplus in stock ready to fill the order upon arrival internally!  
		
		
		
		
		
		
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	Chavez Ravine  | 
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			#2  
			
			
			
			
			
		 
		
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			Just to let everyone know, the differential was brought to our shop to be looked at. Upon close inspection by myself and the former shop owner we can definitely say it is not a restamp and the month of casting is C 
		
		
		
		
		
		
		
		
	
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			#3  
			
			
			
			
			
		 
		
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			I want to thank all the guys at "Flying A restoration" for there help thanks Mik McCarty, Jerry Janing, & Frank Payne 
		
		
		
		
		
		
		
		
	
	![]() www.FlyingARestoration.com  | 
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			#4  
			
			
			
			
			
		 
		
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			I wonder if it was a mistake in the casting date year.  It just seems odd for the rear housing to be dated a year earlier.  Maybe Kurt S has more information on cars in that time frame that might have rears with a 68 casting date instead of 69. 
		
		
		
		
		
		
			
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	69 Z28 JL8, #'s match - being restored  | 
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			#5  
			
			
			
			
			
		 
		
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			After receiving more info today regarding the stamping,it is definitely not a restamped BI housing.  With learning of additional characteristics of a restamped BL it is possibly questionable.  Although the picture of the BE in McNeishs' book also shows the same weaker outer upper strike.  As the Eaton stamp is not visible it just poses one more question. May just be one of those GM mysteries or? I wish I could be of more help to anyone wishing to purchase this, but as they say, when in doubt... 
		
		
		
		
		
		
		
		
	
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			#6  
			
			
			
			
			
		 
		
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			Not to hijaak the thread ..... but, 
		
		
		
		
		
		
		
		
	
	Y'all that think that an Eaton posi in a "COPO" rear has a different spring plate and springs from a "regular" four or three series posi are mis-informed. It's the same guys .... believe me. ![]()  | 
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			#7  
			
			
			
			
			
		 
		
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			here is a link for more info 
		
		
		
		
		
		
		
		
	
	https://www.yenko.net/ubbthreads/show...755&Forum=,,,,,,,,f25,,,,,,,,&Words=be%20posi&Search page=8&Limit=25&Main=80401&Search=true &where=bodysub&Name=&daterange=0&n ewerval=&newertype=&olderval=&oldertyp e=&bodyprev=#Post80755  | 
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			#8  
			
			
			
			
			
		 
		
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			These are original BE spring plates, no ?? 
		
		
		
		
		
		
		
		
	
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			#9  
			
			
			
			
			
		 
		
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			The casting year is probably is a 9 if the axle is original. Real hard to tell cast 6's, 8's, and 9's apart, esp on axles....... 
		
		
		
		
		
		
			
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	Kurt S - CRG  | 
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			#10  
			
			
			
			
			
		 
		
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			I agree its sometimes hard to tell 6's from 8's from 9's on castings, but it sure looks like an 8 and not a 9 to me.   
		
		
		
		
		
		
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	Joe Barr  | 
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