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8 3/4 pumpkin gasket/sealer? #2451878
02/14/18 10:36 PM
02/14/18 10:36 PM
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Wisconsin
wkroncke17 Offline OP
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All,
Putting the rear end together for my Demon.
Trying to do everything the best that I can, and want to make sure from all of the professionals - since I haven’t done all of this since about 1989!?!
When putting the pumpkin in, what is the best gasket to use?
Is any sealer needed? If so, which one? (Blue/Black/cooper?)
Thanks in advance everyone!!

Wally

Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2451886
02/14/18 10:50 PM
02/14/18 10:50 PM
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Michigan
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If you're parts are clean and in good condition - no sealer is needed. The factory didn't use it.
Fel-Pro makes a good gasket - just got mine from Dr. Diff. Most auto supplies offer them too. If you plan on remiving the pumpkin you may want to put a very light coat of Lubriplate on the gasket so it doesn't stick.

Done that on my race cars for years - saves the gasket and clean up time.

Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2451889
02/14/18 10:54 PM
02/14/18 10:54 PM
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Texas
GoodysGotaCuda Offline
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"the right stuff" rtv in a cheese can. It's not cheap, but I haven't found anything better, no gasket needed.


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]
Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2451893
02/14/18 10:58 PM
02/14/18 10:58 PM
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Chicago
PurpleBeeper Offline
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IMO, either would work fine. I've had good luck with just the part-store gaskets, but I've only changed my pumpkin once. If it looks pitted on the surfaces at all you might want a bead of RTV. You don't really need any gasket tack because the gasket will stay in place on the housing studs.

And don't forget those pumpkins are heavy when you're trying to lift it up into place & start some nuts! Now would be the time to put a rear end gear ratio tag on there too.

fyi- I have a 71 Mr Norm Dodge Demon 340 six pack air cleaner. PM me if interested


70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"
Re: 8 3/4 pumpkin gasket/sealer? [Re: PurpleBeeper] #2451909
02/14/18 11:41 PM
02/14/18 11:41 PM
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ahy Offline
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Gasket dry has worked for me if mating surfaces are smooth. Or a little black RTV on the gasket if surfaces are rough works fine. RTV only can work but not really recommended.

With RTV it is best to install the gasket and torque lightly. Let the RTV set up for an hour or so then full torque.

If you do use RTV it is important that surfaces are oil free. No seeping lube anywhere and clean with lacquer thinner first... preferably several times.

Re: 8 3/4 pumpkin gasket/sealer? [Re: ahy] #2451920
02/14/18 11:58 PM
02/14/18 11:58 PM
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Eagle, Idaho
Neil Offline
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Permatex makes a gear oil specific sealer. Want to say the tube is grey with white lettering? It does work good and you can get it apart without using a hand grenade.

I stopped buying the generic blue and black RTV and have been seeking out products that are more tailored to whatever fluid it's making contact with.

I once put a Ford 8" rear together without a differential gasket and it didn't leak. If the two mating surfaces are flat it's totally possible.

Last edited by Neil; 02/14/18 11:59 PM.
Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2451972
02/15/18 01:47 AM
02/15/18 01:47 AM
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RapidRobert Offline
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Good info posted. I'm assuming it ain't gonna be coming out again soon. I would clean the surfaces well/get a parts house gasket/some Indian head brush on sealer. quick easy cheap. On a toughie (stat housings) yes "the right stuff" seals em when sometimes nothing else will (thermostat housing mating surfaces are too narrow).


live every 24 hour block of time like it's your last day on earth
Re: 8 3/4 pumpkin gasket/sealer? [Re: RapidRobert] #2452005
02/15/18 03:46 AM
02/15/18 03:46 AM
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Spokane Washington
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Robert, just did a swap in mine and that's what I used, cleaned both surfaces hospital clean (acetone and a dry rag until it all passed the white glove test) then a thin layer of Indian Head sealant on both surfaces. Worked like a charm, no leaks, and its easy to remove down the road.

Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2452059
02/15/18 11:06 AM
02/15/18 11:06 AM
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IMHO.. I would use one of the superformance non stick gasket or get a seal kit from Dr Diff with non stick gasket.

you can get the axles seals and the foam/bead end gaskets for the backing plates from Dr Diff as well.

thick non stick and reusable.

both good sponsors here on moparts!

Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2452067
02/15/18 11:27 AM
02/15/18 11:27 AM
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Marion, South Carolina [><]
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Ultra Grey silicone here, no gasket. Nothing wrong w/ using a gasket, but I always have silicone on the shelf.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2452131
02/15/18 02:31 PM
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To the silicone/sealer users: how much time do you spend scraping that off both surfaces?

Re: 8 3/4 pumpkin gasket/sealer? [Re: NANKET] #2452137
02/15/18 02:44 PM
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Originally Posted By NANKET
To the silicone/sealer users: how much time do you spend scraping that off both surfaces?



Thank-You...

Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2452272
02/15/18 07:14 PM
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I have pulled rear centers dozen times I use silicone but have found it will leak The Indian head stuff wiil not leak So gasket and that you should be good to go

Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2452304
02/15/18 09:36 PM
02/15/18 09:36 PM
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A thin smear of wheel-bearing grease on both sides of a good paper gasket has always worked for me. I really really hate leaks, but I also hate it when parts are glued together or you have to scrape gaskets off.

Re: 8 3/4 pumpkin gasket/sealer? [Re: topside] #2452373
02/16/18 12:02 AM
02/16/18 12:02 AM
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Superformance gasket with a smear of brake grease to keep it from sticking and makes removal easier twocents

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Re: 8 3/4 pumpkin gasket/sealer? [Re: Neil] #2452382
02/16/18 12:23 AM
02/16/18 12:23 AM
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I also use the Permatex Gear Oil specific RTV. I also use the gasket from any of the parts stores and use this sealant on both sides. I have used it the last two times I pulled mine and it has not leaked. It's a good product 👍

image.png

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Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2452384
02/16/18 12:25 AM
02/16/18 12:25 AM
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Wisconsin
wkroncke17 Offline OP
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Got it put together boys!
Used the right stuff, and a paper gasket.
I want it to stay together and be leak free for a long time.
The right stuff really seems like good stuff.
Thank you all for the advice!!

Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2452422
02/16/18 02:27 AM
02/16/18 02:27 AM
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Spokane Washington
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The "Right Stuff" is a very good product and will likely not leak.....Just pray that you never have to remove it because that stuff is the "Super Glue" of sealants, it can be a grisly task to remove it!

Re: 8 3/4 pumpkin gasket/sealer? [Re: topside] #2452526
02/16/18 01:22 PM
02/16/18 01:22 PM
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Originally Posted By topside
A thin smear of wheel-bearing grease on both sides of a good paper gasket has always worked for me. I really really hate leaks, but I also hate it when parts are glued together or you have to scrape gaskets off.


This is what I do as well; only used RTV once and hated the clean-up when removing and reinstalling the unit. Grease and a Felpro gasket is cheap and easy.

Re: 8 3/4 pumpkin gasket/sealer? [Re: Menzaero] #2452669
02/16/18 05:56 PM
02/16/18 05:56 PM
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RapidRobert Offline
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As said (by some) just me I would not use RTV or TRS in that app, too much scraping to get the RTV off if you think you might be swapping pigs soon (most wouldn't be tho) & with TRS I'd about wanna put a nut on em & drive out the studs before attempting to scrape that stuff off. with cleaned surfaces expecially at the base of the studs, that a dry gasket would suffice, maybe a premium superformance one & even lubeing the gasket if frequent changes are anticipated. You do have a fairly wide contact area there. #1 check for debris.


live every 24 hour block of time like it's your last day on earth
Re: 8 3/4 pumpkin gasket/sealer? [Re: RapidRobert] #2452687
02/16/18 06:29 PM
02/16/18 06:29 PM
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Wisconsin
wkroncke17 Offline OP
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Originally Posted By RapidRobert
As said (by some) just me I would not use RTV or TRS in that app, too much scraping to get the RTV off if you think you might be swapping pigs soon (most wouldn't be tho) & with TRS I'd about wanna put a nut on em & drive out the studs before attempting to scrape that stuff off. with cleaned surfaces expecially at the base of the studs, that a dry gasket would suffice, maybe a premium superformance one & even lubeing the gasket if frequent changes are anticipated. You do have a fairly wide contact area there. #1 check for debris.


Thanks Robert!!
I don't plan on swapping it out anytime soon - but, you know how the best laid plans go....
If I ever go to experimenting with gear ratios, I will definitely try a good gasket and grease.
I made sure both surfaces were hermetically clean before the thin bead of TRS.
My memory reminded me to torque the nuts to 45 ft. pds---sound right?

Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2452805
02/16/18 09:54 PM
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iirc 45 yes. & hermetically clean is even more cleaner than surgically clean right! (no oxygen present?).


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Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2452896
02/17/18 01:24 AM
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If you are going to the drags 70/30 with an 8.75 then it will be apart again.

Re: 8 3/4 pumpkin gasket/sealer? [Re: ScottSmith_Harms] #2452901
02/17/18 01:40 AM
02/17/18 01:40 AM
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Texas
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Originally Posted By ScottSmith_Harms
The "Right Stuff" is a very good product and will likely not leak.....Just pray that you never have to remove it because that stuff is the "Super Glue" of sealants, it can be a grisly task to remove it!


This is true. I had to go back in and remove the whatever pin within the suregrip to use green bearings. I believe breaking the seal on the 3rd involved hydraulics.

That being said, I don't really need to get into the 3rd member on a remotely regular basis.


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
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Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2452949
02/17/18 05:33 AM
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Should have just removed the green bearings and left the 3rd member in there.

Re: 8 3/4 pumpkin gasket/sealer? [Re: NANKET] #2452998
02/17/18 12:15 PM
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Originally Posted By NANKET
To the silicone/sealer users: how much time do you spend scraping that off both surfaces?


If you need to keep removing the pumpkin, you have more troubles than trying to get silicone off the housing.


526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
Re: 8 3/4 pumpkin gasket/sealer? [Re: wkroncke17] #2453076
02/17/18 03:39 PM
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Anybody could have problems, but somebody else may want to change gear ratios.

Re: 8 3/4 pumpkin gasket/sealer? [Re: NANKET] #2453093
02/17/18 04:28 PM
02/17/18 04:28 PM
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North Dakota
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"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: 8 3/4 pumpkin gasket/sealer? [Re: NANKET] #2453364
02/18/18 04:45 AM
02/18/18 04:45 AM
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GoodysGotaCuda Offline
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Originally Posted By NANKET
Should have just removed the green bearings and left the 3rd member in there.


Wilwood brakes require them.


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]
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