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Old 03-19-2018, 11:54 AM   #25
GONIF


 
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Drives: 73 VETTE ,, 05 2500hd diesel,14 1LE
Join Date: Feb 2014
Location: The Left lane PHOENIX AZ
Posts: 2,626
I have always changed the factory diff fluid on a new car or truck after 1500 miles , and then 12000 miles after that every 12000 miles. I always use Redline , and I never have diff problems .
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