diff oil
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
Yes, it's just drain and fill. You have an open diff so no need to add anything.
Place some sort of a catch container under the diff
Unbolt cover
Swear when the fluid misses the container and makes a mess
Clean off mating surfaces
Apply a new bead of your favorite "gasket-in-a-tube" product
Put cover back on
Fill diff through filler hole until fluid runs out.
Place some sort of a catch container under the diff
Unbolt cover
Swear when the fluid misses the container and makes a mess
Clean off mating surfaces
Apply a new bead of your favorite "gasket-in-a-tube" product
Put cover back on
Fill diff through filler hole until fluid runs out.
Post Fiend
Joined: Sep 2005
Posts: 5,955
Likes: 9
From: Ohio
I used 75w140 Royal purple syn, I changed mine 2 months ago. If your gonna go with the royal purple route, they sell it at advanced auto. Well worth the money!! BTW when u unscrew the screw that allows you to fill ur rear end, fill it up until oil comes out. Now you kno its full.
here are step by step instructions.
http://guzzle.rbmicro.com/rdiff.html
here are step by step instructions.
http://guzzle.rbmicro.com/rdiff.html
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Posting Guru
Joined: May 2007
Posts: 1,176
Likes: 1
From: the woodzies
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Posting Guru
Joined: May 2007
Posts: 1,176
Likes: 1
From: the woodzies
Originally Posted by Blue Water Runner
Make sure you use 75w140 oil. Check you diff cover for severe rust. I changed mine to the 08 aluminum cover also.
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Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
Originally Posted by mstiles19
how much did the new cover cost because my cover is really rusty.
http://www.dieselmanor.com/motorcraft/FD-3Z4033A.asp
Ford recommends using a Full Synthetic oil in both the front and rear diffs.
Logistics Pro
Joined: Aug 2007
Posts: 3,974
Likes: 18
From: Millersburg, OH
Also don't forget to check the vent line on the rear diff.The tube it located a little to the left (driver's side) of the diff on the axel tube. Follow the vent line up towards the bed. At the end of the line a small platic V that will sometimes get plugged with mud.
Senior User
Joined: Feb 2008
Posts: 282
Likes: 1
From: Quad Cities, Iowa
I changed my rear diff cover to MAG HYTEC for better cooling and higher capacity.
I changed my front diff cover to Purple Cranium because it's the toughest one out there.
I run valvoline synthetic 75-140 weight in both axles to limit the spare oil I have to carry on trail
I changed my front diff cover to Purple Cranium because it's the toughest one out there.
I run valvoline synthetic 75-140 weight in both axles to limit the spare oil I have to carry on trail
4wd Low
Joined: Jul 2006
Posts: 11
Likes: 5
From: Eagle, ID
Originally Posted by OverEngineer
I changed my rear diff cover to MAG HYTEC for better cooling and higher capacity.
I changed my front diff cover to Purple Cranium because it's the toughest one out there.
I run valvoline synthetic 75-140 weight in both axles to limit the spare oil I have to carry on trail
I changed my front diff cover to Purple Cranium because it's the toughest one out there.
I run valvoline synthetic 75-140 weight in both axles to limit the spare oil I have to carry on trail
Why didn't you get the MagHytec front diff too??? I haven't heard of the Purple Cranium, but may check it out. Wouldn't the MagHytec be just as good, but if not i'm sure it would at least be better than the stock cover...
B.
Senior User
Joined: Feb 2008
Posts: 282
Likes: 1
From: Quad Cities, Iowa
Why two different covers?
I love both covers for different reasons. The rear dissapates more heat and holds more oil - I like this because the rear gears are working all the time - A run to Moab takes about 20 hours. The Rio Grand is about a 25 hour drive.
The front will take a bang and gave me a spot to weld on my hydraulic steering bracket.
I try to protect the diffs as best I can. If this were a trails only truck I would steel fore & aft. So far.... you know...
The front will take a bang and gave me a spot to weld on my hydraulic steering bracket.
I try to protect the diffs as best I can. If this were a trails only truck I would steel fore & aft. So far.... you know...
Originally Posted by Ford 350PSD
OverEngineer: How do you like the MagHytec diff. cover??? I'm thinking of getting one for my 350PSD.
Why didn't you get the MagHytec front diff too??? I haven't heard of the Purple Cranium, but may check it out. Wouldn't the MagHytec be just as good, but if not i'm sure it would at least be better than the stock cover...
B.
Why didn't you get the MagHytec front diff too??? I haven't heard of the Purple Cranium, but may check it out. Wouldn't the MagHytec be just as good, but if not i'm sure it would at least be better than the stock cover...
B.