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I have a 1977 F-150 and was wondering what the difference is between a 77' 9" rear end and a 78' and up. My rear end is going out so I figure I my as well beef it up with a detriot locker and 35 spline axles. The 35 spline axles say they will fit a 78 and up 9" rear end, would I have any problems fitting them to my truck after I put in the 35 spline detroit locker?