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#1045528 - 11/19/16 05:00 AM Axle Leak  
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Fred SS Offline
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Fred SS  Offline
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Glassboro, NJ
Guys, I got a leak coming from the differential housing. Not the rear cover but what looks like a plug weld as shown in the photo below. Looks like GM used a plug weld to secure the axle tubes to the housing. If I'm right, maybe the weld has a few pin holes. I'm thinking I could grind some of the weld out and fill with some pc7 epoxy. Any ideas on how to stop this leak?



87 SS, Harwood cowl induction hood, UMI trailing arms. Hooker 2050 Headers (Jet Hot Coated). Hooker Cat-Back Exhaust, Goodwrench 350, Ported TPI, Trick Flow 56cc alum heads, SLP runners, Comp Cams 260AH-12 cam, Trick Flow 1.5 roller rockers, TCI 2400 stall converter, Denny's 3.5" Driveshaft, GBodyParts GNX Replica Wheels 18x8 & 18x9.
#1045532 - 11/19/16 12:40 PM Re: Axle Leak [Re: Fred SS]  
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Jameson Offline
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Jameson  Offline
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Elizabeth City, NC
I'd use brake clean, then lightly rough the area and clean with some light grinding and then jb weld it.


1988 Monte Carlo SS Eaton 112 5.3/T56 swap, Way to many mods to list.
2015 GMC Sierra Denali



#1045533 - 11/19/16 01:20 PM Re: Axle Leak [Re: Fred SS]  
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MecGen Offline
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Montreal Canada
Thats weird, the axle tube gets pressed fit deeper past that plug, but hey who knows.

With out a doubt try appoxy, worst case get another diff, they can be found pretty cheap.


Space may be the final frontier
but its made in a Hollywood basement.
RedHotChilliPeppers.

1987 MCSS.- Sold
1984 MCSS.- Sold
1984 MCSS - came back smile
1995 Mustang 5.0
1965 Pontiac GTO
1969 Pontiac Firebird
#1045535 - 11/19/16 02:29 PM Re: Axle Leak [Re: Fred SS]  
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mmc427ss Offline
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mmc427ss  Offline
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Pottstown, Pa
That's a common problem, most of the time it's a very minor leak. When I built the 8 1/2" rear I had the tubes welded to the center section and had the plug welds "dressed", re-welded, to avoid that problem. If you got the plug clean enough you could try epoxy, I prefer PC7 over JB weld for repairs like that.
Bob

#1045538 - 11/19/16 02:52 PM Re: Axle Leak [Re: Fred SS]  
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86ttop Offline
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86ttop  Offline
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Brooksville, Fl
pretty common, clean with brake clean and some kind of epoxy will do the trick!


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#1045540 - 11/19/16 06:29 PM Re: Axle Leak [Re: Fred SS]  
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upflying Offline
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upflying  Offline
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Reno, NV
IMO, that's a weep not a leak. There is so little, I wouldn't worry about it beyond wiping the area occasionally.


86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1045549 - 11/20/16 01:05 AM Re: Axle Leak [Re: Fred SS]  
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Fred SS Offline
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Fred SS  Offline
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Glassboro, NJ
Upflying, your probably right. It would be considered a weep not a leak since the fluid does not drip off the diff. But I'm gonna clean the area and try some epoxy. I'm in the process of replacing the fluid anyway.

Thanks guys for your suggestions.


87 SS, Harwood cowl induction hood, UMI trailing arms. Hooker 2050 Headers (Jet Hot Coated). Hooker Cat-Back Exhaust, Goodwrench 350, Ported TPI, Trick Flow 56cc alum heads, SLP runners, Comp Cams 260AH-12 cam, Trick Flow 1.5 roller rockers, TCI 2400 stall converter, Denny's 3.5" Driveshaft, GBodyParts GNX Replica Wheels 18x8 & 18x9.
#1045584 - 11/20/16 11:16 PM Re: Axle Leak [Re: Fred SS]  
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Fred SS Offline
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Fred SS  Offline
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Glassboro, NJ
I cleaned the area with brake cleaner and purple stuff (cleaner). Looks like it's an incomplete weld. GM missed a spot at the top. As some of you said, epoxy should fix that.



87 SS, Harwood cowl induction hood, UMI trailing arms. Hooker 2050 Headers (Jet Hot Coated). Hooker Cat-Back Exhaust, Goodwrench 350, Ported TPI, Trick Flow 56cc alum heads, SLP runners, Comp Cams 260AH-12 cam, Trick Flow 1.5 roller rockers, TCI 2400 stall converter, Denny's 3.5" Driveshaft, GBodyParts GNX Replica Wheels 18x8 & 18x9.
#1045592 - 11/21/16 01:30 AM Re: Axle Leak [Re: Fred SS]  
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mmc427ss Offline
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mmc427ss  Offline
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Pottstown, Pa
Have seen many porous plug welds on rears, seepers. Think it may have something to do with the "can't see it from my house" mentality. My brother-in-law worked at the local plant that built truck frames for GM many years ago, he said it was up to the final touchup guys at the end of the line to make sure most everything was welded correctly, but. How many times have I read about a frame off resto were a lot of time was spent dressing factory welds.
So porous plug welds, there are a lot of them out there.
Bob

#1045774 - 11/26/16 08:02 AM Re: Axle Leak [Re: Fred SS]  
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Buick Runner Offline
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Buick Runner  Offline
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Dharma station 1 the Hydra
A porous weld means a weak weld. I would fix it right by drilling the plug out and reweld it right.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.

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