third member sealant

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philllyc

First time restoration guy
Joined
Apr 10, 2013
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Staten Island NY
I'm installing the ham(aka pumpkin, 3rd member) I was going to do it the old fashioned way with a paper gasket and a few friends told me to use Permatex the right stuff and there is no need for the gasket..
Do any of you have a preference or suggestion?
Your feedback is welcome..

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The Right Stuff is a good sealant and can actually eliminate the paper gasket.
The problem is, The Right Stuff really glues the two parts that it is used on together. It can be a pain getting the parts to separate if you ever need to go back in to what it was used on.
For a differential housing, I make sure the mating surfaces are super clean, use the paper gasket and a light coat of a sealant like Permatex or RTV.
I once assembled a differential housing with just the paper gasket, no sealant. It leaked, not much, a very occasional drip, but that’s no good. So it came back apart, new paper gasket, light coat of sealant and all was good.
 
Pick your poison. Either way will work. I usually use whatever's in my workbench drawer and have never had one leak.
 
Ultra Gray works really well, I use it on front covers on both sides of the gasket and have yet to have one leak. I imagine it would be just as good on the rear axle housing. It's difficult to remove to after it sets, though.
 
I'm installing the ham(aka pumpkin, 3rd member
You forgot Center Section.

Just a point, might be moot but...

If you install without a gasket you are moving the center section towards the rear of the car, making the CL of the gears the axel goes into slightly not in line with the CL of the axel.
 
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Last time I used right stuff on my 8.75 I had to jack my car on the 3rd member to even bust it loose. Which makes putting a oil pan under a pain.
 
Always use a gasket with your preferred sealer, then when it comes apart the gasket rips in half. It comes apart MUCH easier.
 
I'm installing the ham(aka pumpkin, 3rd member) I was going to do it the old fashioned way with a paper gasket and a few friends told me to use Permatex the right stuff and there is no need for the gasket..
Do any of you have a preference or suggestion?
Your feedback is welcome..

View attachment 1715638227

My experience with right stuff , "its hell to get apart later if u need to !"
 
Thanks everyone I did it with a combination of suggestions. Paper gasket extremely light coating of both sides. When it comes to taking it apart I guess I’ll be ripping the gasket apart if need be. I was very uneasy about using it only sealant. Once again thanks everyone. This week fuel lines and brake lines
 
You forgot Center Section.

Just a point, might be moot but...

If you install without a gasket you are moving the center section towards the rear of the car, making the CL of the gears the axel goes into slightly not in line with the CL of the axel.

splitting hairs.
 
Use the gray permitex. Clean and install. I let it sit overnight ( not really necessary) fill with oil and forget it. Don’t forget additive if you need it
 
Thanks everyone I did it with a combination of suggestions. Paper gasket extremely light coating of both sides. When it comes to taking it apart I guess I’ll be ripping the gasket apart if need be. I was very uneasy about using it only sealant. Once again thanks everyone. This week fuel lines and brake lines
This is what I REALLY like. A member asked a question, received several different ideas, selected an idea (or, in this case, combined two), utilized it with success, and then had the courtesy to THANK those who offered suggestions. Good job, @philllyc.
 
This is what I REALLY like. A member asked a question, received several different ideas, selected an idea (or, in this case, combined two), utilized it with success, and then had the courtesy to THANK those who offered suggestions. Good job, @philllyc.

No kiddin. Such a rarity.
 
Thanks everyone I did it with a combination of suggestions. Paper gasket extremely light coating of both sides. When it comes to taking it apart I guess I’ll be ripping the gasket apart if need be. I was very uneasy about using it only sealant. Once again thanks everyone. This week fuel lines and brake lines

And that works fine. As long as you use a light coat, you're good. Where most people F up is, they use a gasket and slob RTV all over the thing. When you do that, even with as many studs as there are, the gasket tries and often does slide out and causes a leak when the nuts are tightened down. Technically, you're not SUPPOSED to use sealant on a gasket at all, but a really light coat like you describe is acceptable and will work well. Nice job!
 
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