with the heat generated out of the differential, I always assumed that probably broke down the properties of the oil over time. 
 Ryan 
		
	
		
		
		
		
		
		
			
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				65 Fastback 91 roller 306, H/C/I 
AOD-Bauman, PI Stallion, 4.10's and traction loc 
 
04 Grand Cherokee Freedom Edition 
 
79 Ford F-250 4x4 - Restored
			 
		
		
		
		
		
		
	
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