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Rear Diff Seal Leak? #5162621 07/16/19 02:31 PM
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Pike51 Offline OP
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I have a very minor leak at the rear diff seal. Anyone have thoughts on just adding some stop leak like Blue Devil? The fluid is fairly new.


1951 Chevy pickup 350/700r4
2015 Chevrolet Suburban LTZ 4x4
Re: Rear Diff Seal Leak? [Re: Pike51] #5162627 07/16/19 02:35 PM
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RamFan Offline
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I doubt the stop leak would work. Gravity is not your friend when it comes to a rear diff leak. Better to pop the cover off and reseal. If the fluid is new, there's nothing wrong with using it again.


18 Giulia Ti Sport Q4
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16.5 CX-5 Touring AWD
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Re: Rear Diff Seal Leak? [Re: Pike51] #5162734 07/16/19 04:39 PM
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Lubener Offline
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Originally Posted by Pike51
I have a very minor leak at the rear diff seal. Anyone have thoughts on just adding some stop leak like Blue Devil? The fluid is fairly new.

Leave it and top off as needed. I would not mess with a minor leak at the pinion seal, only if oil is leaking out an axle seal onto your brakes. An additive likely will not work but you got nothing to lose by trying..

Last edited by Lubener; 07/16/19 04:40 PM.

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Re: Rear Diff Seal Leak? [Re: Pike51] #5162864 07/16/19 07:41 PM
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andyd Offline
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Lubener X2 grin2


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Re: Rear Diff Seal Leak? [Re: Pike51] #5163266 07/17/19 09:05 AM
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Where’s the leak? The OP said “rear diff seal”. At the pinion, or the cover plate.


If you want the job done right......do it yourself.
Re: Rear Diff Seal Leak? [Re: Snagglefoot] #5163348 07/17/19 10:43 AM
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Originally Posted by Snagglefoot
Where’s the leak? The OP said “rear diff seal”. At the pinion, or the cover plate.


Exactly, pinion, axle/hub, or cover?


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Re: Rear Diff Seal Leak? [Re: Pike51] #5163391 07/17/19 11:54 AM
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Sorry... at the pinion.


1951 Chevy pickup 350/700r4
2015 Chevrolet Suburban LTZ 4x4
Re: Rear Diff Seal Leak? [Re: Pike51] #5163396 07/17/19 12:02 PM
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Which vehicle and rear end is it. Perhaps someone can shed some light on how difficult it would be to chance the seal. smile

Last edited by Snagglefoot; 07/17/19 12:03 PM.

If you want the job done right......do it yourself.
Re: Rear Diff Seal Leak? [Re: Pike51] #5163572 07/17/19 03:39 PM
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Originally Posted by Pike51
Sorry... at the pinion.


Ohh, that changes things a bit. I thought you meant at the plate.

You state the leak is very minor. How many drops a day are we talking?


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  • 2.0T I4 - 15k - PP Euro LX 0w30 - Mobil 1 - 10k/1yr

16.5 CX-5 Touring AWD
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Re: Rear Diff Seal Leak? [Re: Pike51] #5163998 07/18/19 05:33 AM
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Originally Posted by Pike51
Sorry... at the pinion.

I had the dealer under extended warranty, replace the pinion seal for a minor leak. I wish i had left it alone. I once had a quiet differential, after their repair the differential had a whine because they got the preload screwed up. It was a PITA dealing with them afterward and getting it straightened out..

My truck has a minor pinion leak, it has been leaking for over twenty years. I had to top off once during that time. Like I said, unless it is leaving a large spot on the driveway overnight, I would leave it alone. You may never have to top it off.

Last edited by Lubener; 07/18/19 05:36 AM.

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Re: Rear Diff Seal Leak? [Re: Pike51] #5168119 07/22/19 01:56 PM
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Pike51 Offline OP
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This is the rear end on my 51 Chevy... it was pulled from a 1969 Buick LeSabre.

Minor as in just seeps and I can wipe fluid away when it's on the lift... sounds like I may just leave it alone.


1951 Chevy pickup 350/700r4
2015 Chevrolet Suburban LTZ 4x4
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