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? on diff. fluid for a Dana 80

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Old Jan 18, 2010 | 07:33 PM
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Nice Work Truck's Avatar
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? on diff. fluid for a Dana 80

I am going to change to rear diff. fluid and have a few ?

I an going to use Royal Purple 75/140.
How much should I get?
What is the best RTV to use for the cover,
I would like to do a Magtech but they are just to much $$$$
 
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Old Jan 18, 2010 | 07:39 PM
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MoyockPowerstroke
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Pick up a Ford '08+ rear diff cover $45. Looks nice and is cast alluminum. You'll need 3.5 qts, and you should pick up Permatex High Temp Black Gasket maker. Here is my recent upgrade.
https://www.ford-trucks.com/forums/a...p?albumid=5523
 
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Old Jan 18, 2010 | 07:47 PM
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They do not make one of those covers for the Dana 80 on the DRW trucks or I would get one.
 
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Old Jan 18, 2010 | 07:49 PM
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MoyockPowerstroke
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Originally Posted by Nice Work Truck
They do not make one of those covers for the Dana 80 on the DRW trucks or I would get one.
Good point...missed that..doh!....Hope the other info helped though?
 
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Old Jan 18, 2010 | 07:52 PM
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Yes thank you.
 
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Old Jan 18, 2010 | 07:59 PM
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He did say Dana 80 your going to need 8.5 pints of 75W-90 + 8 oz. of friction modifier. Add the modifier first, then the oil. Added the friction modifier is only for limited slip rear.
 
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Old Jan 18, 2010 | 08:00 PM
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The dana 80 takes 75-90 synthetic, not the typical 75-140. It will hold 4 quarts.
 
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Old Jan 18, 2010 | 08:04 PM
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Great thanks
That would not have been good.
The Royal Purple or Mobil 1 already has the friction modifier in it I think.
 
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Old Jan 18, 2010 | 08:45 PM
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I would recommend this to anyone who has the limited slip differential and notices a need for modifier;
Just add enough modifier to rectify the chatter problem when turning and don't get the stuff on anything you want to keep around, the stuff stinks.
 
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