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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 03-19-2007, 06:49 AM   #1 (permalink)
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differential fluid change

Seems to be pretty straight forward procedure to do both front and rear. Is there anything special I need to know? What are the capacities front and rear? What's a good fluid to use?


Thanks


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Old 03-19-2007, 09:23 AM   #2 (permalink)
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Re: differential fluid change

Go to Guzzle's page and go down near the bottom under "Maintenance." This guy took a lot of time for these how-tos and they are quite good.
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Old 03-19-2007, 11:44 AM   #3 (permalink)
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Re: differential fluid change

I just did mine Friday night. Pretty straightforward. Guzzles page is excellent.
I used Royal Purple 75-140, got it at NAPA for 9.98 per Quart, and it takes 3.5 quarts.
I used the "Ultra Black" permatex silicone.
I didn't powdercoat my cover like Guzzle did, but I did clean it and paint it with Rustoleum.
I only did mine because it is close to 100k and I didn't think it had ever been changed. When I popped the cover off it confirmed to me that it had never been changed!

I haven't done the front yet. Just the rear. Hope this helps!
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Old 03-19-2007, 11:52 AM   #4 (permalink)
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Re: differential fluid change

very easy job, just add as little of the additive as it takes to make the chatter go away. Mine too 4 oz, Ford calls for 8 no wonder why most of their LS don't work??
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Old 03-19-2007, 07:03 PM   #5 (permalink)
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Re: differential fluid change

[ QUOTE ]
Go to Guzzle's page and go down near the bottom under "Maintenance." This guy took a lot of time for these how-tos and they are quite good.

[/ QUOTE ]


Thanks for the link Jon!



Craig
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Old 03-19-2007, 10:54 PM   #6 (permalink)
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Re: differential fluid change

Did mine about eight months ago and should have waited longer between reinstalling the cover (with uncured silicone) and filling the diff with fluid. I think I would wait overnight for the silicone to cure if I had to do it over again as I developed a hanging drip last week. I don't think the silicone will cure where submerged in oil? Oh well, this has given me a good excuse to get a Mag-Hytec while I'm re-replacing all those $$'s worth of synthetic fluid...
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Old 03-20-2007, 09:00 AM   #7 (permalink)
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Re: differential fluid change

You should be able to reuse the fluid if it's only been in 8 months.

Another way to loosen the cover (besides the scraper) is to hit it lightly with a dead-blow hammer. A couple of light raps is usually all it takes to start the oil flowing.

In my experience a drip leak is not caused by the RTV not curing, but by incomplete coverage of the sealing surfaces (e.g., not getting the old silicone off, or not completely surrounding the bolt holes. I usually let it set for 20 minutes before reinstalling the cover.
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Old 03-20-2007, 09:20 AM   #8 (permalink)
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Re: differential fluid change

No problem. When I do mine in the next few weeks, I'm going to use the Royal Purple like some of the other guys. It has the friction modifier in it already so you don't have to fool with that part of the job.

Yes, I'm lazy.
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Old 03-20-2007, 06:00 PM   #9 (permalink)
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Re: differential fluid change

Where did you get your Mag Hytek cover? I need to change my fluids and wouldn't mind a new cover either.
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Old 03-20-2007, 07:11 PM   #10 (permalink)
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Re: differential fluid change

[ QUOTE ]
Where did you get your Mag Hytek cover? I need to change my fluids and wouldn't mind a new cover either.

[/ QUOTE ]

Several sponsors sell them - including
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Old 03-20-2007, 08:07 PM   #11 (permalink)
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Re: differential fluid change

Suggested option, ""NOT RECOMMENED" here by the TDS boys...

Just get yourself a cheap hand pump from Wal-mart, marine dept. $15.00...pump out about as much as you can...may 2.5 qts..replace with Royal Purple, ""WHAT YOU CAN"...drive for awhile....>>>""REPEAT""<<< procedure in a couple of weeks.....

YAHH!!!! You use a couple more qts of grease..."BUT"" each operation only takes ""MINUTES AND NO MESS"""

>>>START FLAMING AWAY<<<<
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Old 03-21-2007, 09:20 AM   #12 (permalink)
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Re: differential fluid change

Thanks for your help guys. What weight oil should I use for front and rear?


Craig
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Old 03-21-2007, 09:24 AM   #13 (permalink)
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Re: differential fluid change

75W-140 for the rear.

75W-90 for the front.

Use synthetic stuff....like the Royal Purple [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Old 03-21-2007, 10:04 AM   #14 (permalink)
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Re: differential fluid change

[ QUOTE ]
Suggested option, ""NOT RECOMMENED" here by the TDS boys...

Just get yourself a cheap hand pump from Wal-mart, marine dept. $15.00...pump out about as much as you can...may 2.5 qts..replace with Royal Purple, ""WHAT YOU CAN"...drive for awhile....>>>""REPEAT""<<< procedure in a couple of weeks.....

YAHH!!!! You use a couple more qts of grease..."BUT"" each operation only takes ""MINUTES AND NO MESS"""

>>>START FLAMING AWAY<<<<

[/ QUOTE ]

That's all the quickie lube boys do. They put the fill hose to the bottom of the diff and pump in fresh lube - the old lube overflows out the fill hole.

Guaranteed both methods leave some crud in the bottom of the diff, but the diff has room at the bottorm for it. These options are MUCH better than doing nothing which is what most people do when faced with the task of removing the cover and having to seal it back up.
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Old 03-22-2007, 10:26 PM   #15 (permalink)
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Re: differential fluid change

Did mine 2 weeks ago. Super easy...but can be messy. Be sure to have some plastic down.
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