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#573878 - July 13th 2012 1:38 pm Leaking u-joint or output seal?
F350 Offline
old hand

Registered: February 13th 2010 4:40 am
Posts: 1122
I found this trail of fluid on the chassis, it looks like it either came from the tranny tail end or the u-joint or the driveshaft. Pattern says it does this while the van is in motion.


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#574100 - July 15th 2012 2:39 am Re: Leaking u-joint or output seal? [Re: F350]
86ed Offline
veteran

Registered: May 24th 2006 12:00 pm
Posts: 2294
Loc: puyallup,wa
my 75 has that same pattern. I put in new u joints and had the rear tranny seal replaced after I got it. I never cleaned it up however, maybe I should to make sure it's not still happening. sorry not to be any real help

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#574112 - July 15th 2012 11:03 am Re: Leaking u-joint or output seal? [Re: F350]
SaabGuy Offline
old hand

Registered: April 12th 2012 8:32 pm
Posts: 733
Loc: Liberty, IN
I would think its most likely the tranny seal. There isn't much fluid in the u-joint. Just a little grease. Lucky for you the seal isn't expensice and really easy to replace. All you have to do is remove the driveshaft and use a seal puller to remove bad seal and tap in a new one. Just be sure to put some grease or smear some tranny fluid on the slip yoke upon reassembly so you don't trash the new seal by burning it up.
_________________________
When Chris Farley talked about living in a van down by the river, did anybody else think that wasn't such a bad idea?

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#574171 - July 15th 2012 4:23 pm Re: Leaking u-joint or output seal? [Re: F350]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
That is certainly from a leaky U-Joint.

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#574175 - July 15th 2012 4:35 pm Re: Leaking u-joint or output seal? [Re: F350]
Reed Offline
carpal tunnel

Registered: August 27th 2001 12:00 pm
Posts: 8438
Loc: Fircrest, WA
There is no way a u-joint would make that kind of a spray pattern. As has been mentioned, there just isn't that much fluid in the u-joint, and it would be VERY difficult for it to leak out unless you had a crack in one of more of the u-joint caps. I second the suggestion that it is a rear seal, and I also think it could be fluid running back along the length of the trans until it get onto the spinning yoke and then is thrown into the bottom of the van. Check for leaks all the way forward.
_________________________
Windows- they're what make a van worth owning!

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#574190 - July 15th 2012 6:33 pm Re: Leaking u-joint or output seal? [Re: Reed]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
Well we shall see then

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#574191 - July 15th 2012 6:34 pm Re: Leaking u-joint or output seal? [Re: Reed]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
I do see some dirt rust colouring in the residue which would be from a failed u-joint cap seal, water contaminated and finally seal bursted.

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#574240 - July 16th 2012 12:31 am Re: Leaking u-joint or output seal? [Re: F350]
SaabGuy Offline
old hand

Registered: April 12th 2012 8:32 pm
Posts: 733
Loc: Liberty, IN
Never said I was always right. Once you pull the driveshaft out check the u-joint. Would be a great time to replace anyway. That just looks like a lot of juice. Specially when you think thats just 1/3 or it. The rest is all over the road.
_________________________
When Chris Farley talked about living in a van down by the river, did anybody else think that wasn't such a bad idea?

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#574242 - July 16th 2012 12:38 am Re: Leaking u-joint or output seal? [Re: SaabGuy]
wrcsixeight Offline
veteran

Registered: April 30th 2010 8:57 pm
Posts: 1927
Loc: San Diego
I have similar marks on my undercarriage, but at both ends of my driveshaft, and they existed when I got my Van, 11 years ago next month.

I've never lost any tranny fluid, in my ownership.

That reminds me, I need a new cartridge for my grease Gun.

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#574259 - July 16th 2012 8:53 am Re: Leaking u-joint or output seal? [Re: SaabGuy]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
Yes I agree, many people wouldn't think that there is much grease in a u-joint cap but you most people don't take into consideration that grease expands when heated also with age water gets inside the bearing cap and carnage from there. Worst thing is those greasable joints, that grease just flies all over the place. I'm so happy with my new driveshaft, doesn't leak or anything. But I do have an output shaft seal leak but it doesn't splatter anywheres, my seal leaks a little bit and thing is I have replaced it twice, I never used any RTV when I put the seal in but there isn't a reason to. I don't know what I'm going to do about it, probably just cheap aftermarket seal.

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