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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Rear Differential Leak

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Old Jun 30, 2023 | 01:20 AM
  #1  
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Rear Differential Leak



Im no mechanic, but this doesn’t look good. Just got to work (night shift) and heard something, so I took a look underneath and see that the rear differential is pouring oil. Anyone have a good idea where I could start with fixing this?
 
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Old Jun 30, 2023 | 05:17 AM
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Not knowing the axle it could be the cover gasket, 3rd member gasket or pinion seal.
Is the vent clear/ open on the axle?
Dave ----
 
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Old Jun 30, 2023 | 07:45 AM
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That front seal looks new, is it ?

I would not drive it until you verify there is enough fluid in the diff.

On top of the diff normally on the drivers side there will be a rubber hose for the vent.


I changed my rear diff fluid a few weeks ago, I use just the paper gasket to seal the cover.



 
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Old Jun 30, 2023 | 08:01 AM
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Originally Posted by L. Reaper
heard something, so I took a look underneath and see that the rear differential is pouring oil.
Definitely don't drive it like that. If a simple leak was the extent of the problem, such as a worn seal or loose gasket, it would have been quiet as a church mouse. Nor would the volume been all that bad for a garden variety leak. Most likely something came apart inside the differential and dislodged the seal at the front.

Chock the wheels and set the parking brake. Put the transmission in neutral so the driveshaft is unloaded. Shake the shaft at the front of the differential. I suspect you will find a lot of play.

Call a tow truck to get home. You've lost all oil in addition to a strong possibility of internal damage. Is the damage repairable? Unknown for now, but not very likely if you try driving home like that and make it worse.
 
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Old Jul 18, 2023 | 02:16 PM
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I have a similar issue, leaking diff, with my 2005 E450 Minnie Winnie but not sure I should ask it here.
 
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Old Jul 18, 2023 | 02:23 PM
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Originally Posted by Frankie4fingers
I have a similar issue, leaking diff, with my 2005 E450 Minnie Winnie but not sure I should ask it here.
Can you get some pictures so we can see where the leak is ?

Is yours just from the Pinion seal or is there a crack in the housing ? pictures front and back would be great.

If its just the Pinion seal, the driveshaft will need to be removed and the Pinion nut removed to get to the seal.
 
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Old Jul 18, 2023 | 10:27 PM
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2005 E450 pinion seal leak

Originally Posted by Max Capacity
Can you get some pictures so we can see where the leak is ?

Is yours just from the Pinion seal or is there a crack in the housing ? pictures front and back would be great.

If its just the Pinion seal, the driveshaft will need to be removed and the Pinion nut removed to get to the seal.
I will get pics tomorrow. The main reason I am asking is the diff pinion shimmed or non-shimmed . I seen vids on how to do non-shimmed, i.e. marked everything and count the number of turns on the nut. Found the label

 
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Old Jul 20, 2023 | 11:12 PM
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Oil weeping thru weld windows

 
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Old Jul 23, 2023 | 08:09 PM
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Well…

Sorry for the late update, finally got around to working on it. Looks as though it wasn’t the pinion seal, unfortunately didn’t realize until after I changed the seal. I learned I should be a little more vigilant next time and look things over better haha.

 
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Old Jul 23, 2023 | 10:28 PM
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Originally Posted by L. Reaper
Oy vey! What happened? Did something grenade from the inside? Looks like metal is pushed out.
 
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Old Jul 24, 2023 | 12:48 AM
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Originally Posted by L. Reaper
Sorry for the late update, finally got around to working on it. Looks as though it wasn’t the pinion seal, unfortunately didn’t realize until after I changed the seal. I learned I should be a little more vigilant next time and look things over better haha.
Holy church key, Batman....
 
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Old Jul 24, 2023 | 11:54 AM
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8.8 with 3.55 gears? Take the cover off to see how bad it is. It looks like the cross pin came out and hit the cover. Depending on the damage, it might be easier to swap out the axle with one from a junkyard.
 
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Old Jul 24, 2023 | 07:41 PM
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Originally Posted by My4Fordtrucks
8.8 with 3.55 gears? Take the cover off to see how bad it is. It looks like the cross pin came out and hit the cover. Depending on the damage, it might be easier to swap out the axle with one from a junkyard.

It’s completely shot in there, so I’m looking around for a axle match, but due to the condition of the rest of the body I’m also looking for something to possibly swap the engine into. The 302 is in great shape but unfortunately everything else is on its last leg, not sure what I’m going to do yet, depends on what I find but I’ll post an update.
 
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