differential fluid leak
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Freshman User
Joined: Apr 2010
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From: Bonita Springs, FL
differential fluid leak
i will try and post a pic with it but for some reason it doesnt work. i have oily residue all over my front drive shaft past the transfer case where the pinion shaft is (with the snap rings?). i read a few threads it might be a dust seal but i cant seem to find anything that might be cracked or missing. any help? hope the pic comes through..
o its a 99 250 superduty 5.4 4X4
o its a 99 250 superduty 5.4 4X4
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Freshman User
Joined: Apr 2010
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From: Bonita Springs, FL
http://i751.photobucket.com/albums/x...llhite/016.jpg
maybe this outta work, if you click the link...
maybe this outta work, if you click the link...
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Freshman User
Joined: Apr 2010
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From: Bonita Springs, FL
any advice on repair? labor intensive? the part cant be much if its just a seal/gasket, but it seems like a major pain to mess with the drivetrain.... if anyone has a step by step DIY friendly guide i would love to take a look, or at least maybe what part i need.. what could go wrong if it goes untreated? should i be concerned?
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Thread Starter
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Freshman User
Joined: Apr 2010
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From: Bonita Springs, FL
yeah it hasnt gotten worse since i bought the truck, i was just bored on my day off and browsing under my truck (i cant be the only one who does that, can i??) and was wondering if it would eventually turn into a problem... its always possible someone before me overfilled the fluid, but i should probly rule that out as 2 of you said it appears to be leaking. i guess i could just add a little more grease if its low, isnt there a fluid level check bolt on the transfer case? there are 2 bolts, i assume the higher one up is for checking, the lower for drainage...
Elder User
Joined: Jun 2009
Posts: 560
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From: 92592
Read the manual, you do not fill it all the way or you'll have..........................wait for it............................pinion seal leaks.
Also check the vent tube to make sure its clear; it its plugged you'll build up pressure as the third member heats and the fluid will push out of the ...............................pinion seal.
Pop for the 2008 finned alum rear cover ($50.00) and do a complete service with 75-140 synthetic (and friction modifier) then you know its right.
Edit: Sorry, just noticed its the front, scratch the cover idea and use 75-90 synthetic.
Also check the vent tube to make sure its clear; it its plugged you'll build up pressure as the third member heats and the fluid will push out of the ...............................pinion seal.
Pop for the 2008 finned alum rear cover ($50.00) and do a complete service with 75-140 synthetic (and friction modifier) then you know its right.
Edit: Sorry, just noticed its the front, scratch the cover idea and use 75-90 synthetic.
Postmaster
Joined: Jun 2008
Posts: 2,564
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From: Wayyy NoCal, USA
If it were mine, the most I would do is keep an eye on the fluid level. Well, maybe wipe it down every couple months as well...
Getting a pinion to seal up perfectly for more than 10 years can be extremely difficult. Weeping is pretty much normal at that age. And to truly fix a "weeper", you frequently need to replace the pinion (and maybe a bearing or two) as well. The tiny groove the seal lip wears into the pinion shaft makes it difficult for a new seal to seal perfectly. And if there is even a bit of play in the bearings, the pinion will wobble just enough to let it weep.
Getting a pinion to seal up perfectly for more than 10 years can be extremely difficult. Weeping is pretty much normal at that age. And to truly fix a "weeper", you frequently need to replace the pinion (and maybe a bearing or two) as well. The tiny groove the seal lip wears into the pinion shaft makes it difficult for a new seal to seal perfectly. And if there is even a bit of play in the bearings, the pinion will wobble just enough to let it weep.
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Freshman User
Joined: Apr 2010
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From: Bonita Springs, FL
thanks for the advice! where is the vent tube so i can check it? hope these dont appear as stupid question, just not too familiar with my trucks underbody, still pokin around...
Hotshot
Joined: Mar 2007
Posts: 10,101
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From: Pa
It will cost under $200 to get the pinion seal replaced at the dealer, at least it should. My dad got his done the beginning of the year and it was under $190 out the door. Mine leaks a very slight bit but thats because I put a tad too much oil in it. I'd keep an eye on the oil level and run it. Clean the diff with some brake cleaner to remove the oil every now and then.
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