rear diff, front diff, transfer case
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Elder User
Joined: Sep 2007
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From: N.Y.
rear diff, front diff, transfer case
My front and rear diff / transfer case need the fluids changed and I want to get my facts together so I can buy the right stuf and get it done.
I would like to know what I need (I know i am going ot buy everything from Ford but what to get and how much to get would be great info.
also im sure I can figure out where the fill plugs are on the diff's but any pics / help would be appreciated. Also im not sure exactly how to to the transfer case....
Thank you
I would like to know what I need (I know i am going ot buy everything from Ford but what to get and how much to get would be great info.
also im sure I can figure out where the fill plugs are on the diff's but any pics / help would be appreciated. Also im not sure exactly how to to the transfer case....
Thank you
Fleet Mechanic
Joined: Jun 2006
Posts: 1,589
Likes: 20
Your owners manual will tell you what and how much you need.
Around 3 quarts of 75W-90 synthetic diff oil for the front. No drain plug. Either remove the cover to drain or suck it out with a vacuum pump. Fill plug on driver side of diff.
Around 4 quarts of 75W-130 synthetic diff oil for the rear. No drain plug. Either remove the cover to drain or suck it out with a vacuum pump. Fill plug on passenger side of diff.
Around 3 to 4 quarts of synthetic ATF for the transfer case. Both fill and drain plug are on the back of the Xfer case. Drain plug at the bottom and fil plug about half way up.
I used Royal Purple synthetic diff oil and Synchromax manual tranny fluid for the Xfer case.
If you use synthetic diff oils you do not have to add the 4oz bottle of limited slip additive.
DSMMH
Around 3 quarts of 75W-90 synthetic diff oil for the front. No drain plug. Either remove the cover to drain or suck it out with a vacuum pump. Fill plug on driver side of diff.
Around 4 quarts of 75W-130 synthetic diff oil for the rear. No drain plug. Either remove the cover to drain or suck it out with a vacuum pump. Fill plug on passenger side of diff.
Around 3 to 4 quarts of synthetic ATF for the transfer case. Both fill and drain plug are on the back of the Xfer case. Drain plug at the bottom and fil plug about half way up.
I used Royal Purple synthetic diff oil and Synchromax manual tranny fluid for the Xfer case.
If you use synthetic diff oils you do not have to add the 4oz bottle of limited slip additive.
DSMMH
Fleet Mechanic
Joined: Jun 2006
Posts: 1,589
Likes: 20
You can scrape the gasket and use a new OEM gasket.
or
You can use the Permatex black Right Stuff. I used this when I changed the fluid the first time. Bolted the cover on and filled her right up with fluid. Never had a leak.
My OEM covers are no in China and I now have the Mag-Hytech aluminum high capacity front and rear diff covers that have embedded O rings for seals. Sweet!
DSMMH
or
You can use the Permatex black Right Stuff. I used this when I changed the fluid the first time. Bolted the cover on and filled her right up with fluid. Never had a leak.
My OEM covers are no in China and I now have the Mag-Hytech aluminum high capacity front and rear diff covers that have embedded O rings for seals. Sweet!
DSMMH
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
There are no gaskets on either diff. It is silicone from the factory.
Also, Permatex has a new silicone RTV sealant specifically intended for diff covers. I haven't used it yet, but that's what I would choose.
Also, Permatex has a new silicone RTV sealant specifically intended for diff covers. I haven't used it yet, but that's what I would choose.
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Elder User
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From: Smiths Grove, KY
https://www.ford-trucks.com/forums/8...with-pics.html
Welcome to guzzle's Transfer Case Fluid Change Web Page
Welcome to guzzle's Rear Differential Maintenance Web Page
Welcome to guzzle's Front Differential Maintenance Web Page
Bill - Nice job on the write-up you posted. I tried to rep you, however I must first spread the love to others.
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Senior User
Joined: Jul 2007
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From: central valley, CA
I have an automatic tranny and it states to use Mercon V ATF for the Xfer case. Can Synchromax manual tranny fluid be used or is it for 6.0's with manual trans?
wooohooo!!! Thanks for the help guys!!!
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