magnonreyes Posted June 30, 2014 Report Share Posted June 30, 2014 I am going to upgrade my gt500 2012 rear differential with a bigger cover, is there a great fluid to fill it up with? Link to comment Share on other sites More sharing options...
bigsnake Posted June 30, 2014 Report Share Posted June 30, 2014 After some research this is the route I went. Link to comment Share on other sites More sharing options...
05mustangman Posted July 1, 2014 Report Share Posted July 1, 2014 I also went with a 75W-140 but I went with the Royal Purple. Also had a bottle of Motorcraft Friction Modifier put in. Link to comment Share on other sites More sharing options...
magnonreyes Posted July 1, 2014 Author Report Share Posted July 1, 2014 Thank you so much guys, i really appreciate this. Link to comment Share on other sites More sharing options...
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