Broken_Wankel Posted July 28, 2006 Report Share Posted July 28, 2006 I tried googling, but came up with different answers from oil viscosity to either or not you should run sythetic. So, since there seems to be a large number of 03-04 cobra owners on here, I figured this is as good of a place to ask as any. So, if one needs to fill up a rear diff from an 03-04 cobra, what kind of fluid should I use, and how much? Thanks Quote Link to comment Share on other sites More sharing options...
twistedfocus1647545489 Posted July 28, 2006 Report Share Posted July 28, 2006 Doesn't take much. I think I used about 2 quarts last time, but had 3 on hand just in case. Just make sure the dif is fairly level and fill until it comes out the fill plug. I would use 90wt. I have also read alot about not using synthetics, but I have always had pretty good luck with synthetics. When I swapped the Eaton for a Torsen I used Red Line Shock Proof (Heavy). It's a 75w90 that they claim has the shock protection of a 75w250 (and some scientific jargon about "particulate solids"). Quote Link to comment Share on other sites More sharing options...
90gt Posted July 29, 2006 Report Share Posted July 29, 2006 The newer Mustangs use 90wt synthetics in the rearend, or atleast my Mach 1 does according to the tag on the rearend. Quote Link to comment Share on other sites More sharing options...
stolen 5.0 Posted July 31, 2006 Report Share Posted July 31, 2006 2 quarts of royal purple 75w90 Quote Link to comment Share on other sites More sharing options...
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