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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

Leak fix

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Old Sep 24, 2013 | 02:43 PM
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Leak fix

Was draining the HFCM & noticed a leak of tranny fluid. Looks like it is where the transfer case & transmission come together. Transmission fluid is dead on which leads me to believe its the transfer case that is losing fluid.

Anyone know the cause of this leak..? which seal causes this type of leak..? Trying to figure out how to fix this & hoping not to break the bank.










I know others have had leaks of this sort, & am trying to tap into everyone else's knowledge for this. This is the first place Ive come. I literally just crawled out from under my truck minutes ago, & loaded these pics. Thanks
 
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Old Sep 24, 2013 | 05:27 PM
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The transfer case and transmission fluids are different, so that is a transmission side leak you have. The transmission output shaft seal is the only suspect I believe. You have to remove the transfer case in order to replace the transmission output shaft seal. If it's not under warranty and just a slow seep it's probably better to just keep an eye on it and not replace the seal unless it gets worse.
 
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Old Sep 24, 2013 | 06:22 PM
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Originally Posted by wp6529
The transfer case and transmission fluids are different, so that is a transmission side leak you have. The transmission output shaft seal is the only suspect I believe. You have to remove the transfer case in order to replace the transmission output shaft seal. If it's not under warranty and just a slow seep it's probably better to just keep an eye on it and not replace the seal unless it gets worse.
Do you believe its the tranny output shaft seal solely because of the fluid..? Reason I ask is, the transfer case has Mobil 1 atf in it. Very similar color to the ford atf that is in the tranny

It is not under warranty.
 
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Old Sep 24, 2013 | 06:50 PM
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I think either way you are going to have to separate them to tell which one and to replace either side.

No matter how you slice it you are going to have to do it.

I'd of course opt to pull just the transfer case--duh..
 
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Old Sep 24, 2013 | 08:08 PM
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The transfer case is not supposed to have ATF in it per Ford spec and the Owner's manual:

Transfer case fluid 2.0 quarts (1.9L)
Motorcraft Transfer Case
Fluid

XL-12 / —

Automatic transmission


fluid (5R110)
3
17.5 quarts
(16.6L)


5 (includes
remote filter
element change)
Motorcraft
MERCON

LV ATF
XT-10–QLV /
MERCON
LV

On my 2009 F350 the transfer case has a slight seep at that point and the fluid looks like proper transfer case synthetic gear lube which is not red.



In any case, if it's a seep that isn't leaving drips on the ground or causing a noticable loss of fluid I'd just monitor and not go to the trouble of replacing the seal unless the leak got worse.


 
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Old Sep 24, 2013 | 10:42 PM
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Dang wp... that looks like the exact same leak I have.
 
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Old Sep 24, 2013 | 10:50 PM
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Originally Posted by wp6529


In any case, if it's a seep that isn't leaving drips on the ground or causing a noticable loss of fluid I'd just monitor and not go to the trouble of replacing the seal unless the leak got worse.







So you mean, UNTIL it gets worse, right..? I mean, I don't see yours or mine getting better by themselves right?

How difficult a job is replacing that seal..? I've looked on youtube but havn't been able to find a vid of it. I would imagine the dealer would want an arm & a leg for it but, am curious if it's something I could tackle myself or not.
 
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Old Sep 25, 2013 | 08:00 AM
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Mine has been like that at least 4 years and hasn't gotten any worse.
 
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Old Sep 25, 2013 | 11:22 AM
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Originally Posted by wp6529
Mine has been like that at least 4 years and hasn't gotten any worse.
Wow really..?!! So it pretty much leaked right out of the gate..?

Why no warranty claim to get it fixed/stopped..?

So, how often do you check the fluid level in your transfer case..?

Im curious, how many miles do you have on your truck..?

Thanks for the info man. Sounding like its not a big deal which, is refreshing. I know that I never see any drops on the ground from mine but, it must be happening at least some. Again, it looks like our leaks are very similar too.
 
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Old Sep 25, 2013 | 12:04 PM
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XL-12 Ford Transfer Case Fluid looks absolutely identical in colour and appearance to all their other ATFs be that Mercon V, LV, SP or Premium Automatic Transmission Fluid.
 
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Old Sep 25, 2013 | 04:29 PM
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Originally Posted by m-chan68
XL-12 Ford Transfer Case Fluid looks absolutely identical in colour and appearance to all their other ATFs be that Mercon V, LV, SP or Premium Automatic Transmission Fluid.
Well, clearly what is leaking from mine is not red, and that is/was the original factory fill. It was changed at 50k (currently at 92k), and the seep hasn't changed color so presumably they found the same non red fluid as the original.

I park on a concrete driveway (truck won't fit in the garage) and I work from home, so the truck routinely sits for days at a time. I have never seen a single drip from that transfer case seep which is why I've never bothered to have it fixed.

I suspect it's something like a scratch on the shaft the seal sits on that is letting a tiny bit for fluid by. If so, replacing the seal wouldn't fix it and the entire shaft might need replacement.
 
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