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gear oil weight and how much?

Old 12-19-2009, 07:48 AM
  #11  
03BottleFedGT
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if you use royal purple you do not need friction modifier it already has it in it. if you use another brand yes you will need modifier. 75w90 3 quarts
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Old 12-19-2009, 08:44 AM
  #12  
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Originally Posted by Chris98Gt View Post
Do you not need the friction modfier with the synthetic gear oil?
It depends, most brands do not, but some do--check the manufacturer's web sites. However in general synthetics do not need the FM as they are sufficiently "slippery" already...
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Old 12-19-2009, 10:06 AM
  #13  
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Never knew that, thanks for the info. I don't actually use the synthetics, but was just wondering since noone mentioned it.
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Old 12-19-2009, 02:44 PM
  #14  
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so either weight looks like it wll work is what im getting out of this...
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Old 12-19-2009, 02:55 PM
  #15  
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no 75w90 is what you need
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Old 12-19-2009, 05:08 PM
  #16  
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Originally Posted by 03BottleFedGT View Post
no 75w90 is what you need
The Ford owner's manuals, and shop manuals, from 2001:



to 2010:



All recommend 75W-140 gear oil, with 4 oz of friction modifier meeting Ford spec EST-M2C118-A, if using the Motorcraft SEA 75W-140 Rear Axle Lubricant.

2001:



2010:


Last edited by cliffyk; 12-19-2009 at 11:39 PM.
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Old 12-20-2009, 03:48 PM
  #17  
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dude you make it sort of confusing... so 75-145 royal purple is it... yes or no... all theses graphs and stuff is telling me 75-145.... right
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Old 12-20-2009, 06:02 PM
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Originally Posted by Pubydingus View Post
dude you make it sort of confusing... so 75-145 royal purple is it... yes or no... all theses graphs and stuff is telling me 75-145.... right

What is the confusing part? Ford has said to use 75W-140 since 2001...
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Old 12-20-2009, 07:49 PM
  #19  
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LOL...The internet is great....At the end of the day you can't argue with the Ford Manual. End of story...
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Old 12-20-2009, 09:32 PM
  #20  
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yo cliff what kind of shifter handle do you have (the yellow or gold thing that the shift **** connects to) do you have?
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