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Differential sealing: gasket vs rtv #4096104 05/13/16 07:16 PM
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buck91 Offline OP
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Going to be rebuilding the traclok in the mustang this year as as well as putting an Eaton posi in the truck. Probably have a shop do the position, actually.

Anyways, since both are clutch type LSD I'm thinking about a reusable gasket for the dif covers to make subsequent fluid or dif services that much easier. Do these tend to work pretty well, assuming bolts are torqued to spec with thread locker? Or are leaks common enough to warrant rtv?


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Differential sealing: gasket vs rtv [Re: buck91] #4096108 05/13/16 07:20 PM
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RedOakRanch Offline
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I used one on my 10 bolt Chevy with a stamped cover. Worked good from day one until now. Haven't taken it off and reused it yet though.


1994 Ford Crown Vic 207k-Frankenbrew 0w20,30,40!
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Re: Differential sealing: gasket vs rtv [Re: buck91] #4096127 05/13/16 07:40 PM
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CT8 Offline
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A gasket if available makes servicing the unit as fun as servicing can be.

Re: Differential sealing: gasket vs rtv [Re: buck91] #4096133 05/13/16 07:48 PM
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The_Eric Offline
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RTV and drill/weld a fitting to drain.


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Re: Differential sealing: gasket vs rtv [Re: buck91] #4096142 05/13/16 07:59 PM
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barkingspider Offline
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I prefer gasket or gasket with a lil bit of rtv on both sides of the gasket, zero problems. I have never used a reusable gasket


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Re: Differential sealing: gasket vs rtv [Re: buck91] #4096143 05/13/16 07:59 PM
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JHZR2 Offline
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I went gasket and mag hytec with Adrain and dipstick.

Originally Posted By: barkingspider
I prefer gasket or gasket with a lil bit of rtv on both sides of the gasket, zero problems. I have never used a reusable gasket


Isn't Indian head shellac the the product for that job?

Re: Differential sealing: gasket vs rtv [Re: CT8] #4096265 05/13/16 11:45 PM
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Rand Online Content
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Originally Posted By: CT8
A gasket if available makes servicing the unit as fun as servicing can be.


Drain and fill plugs infinitely better.


2019 Jeep Cherokee Trailhawk 2.0T
Re: Differential sealing: gasket vs rtv [Re: buck91] #4096389 05/14/16 08:01 AM
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01rangerxl Offline
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I have been thinking of getting a Lube Locker gasket for my 8.8 equipped truck. They say they are reusable, but I don't know anyone who has used one.

I thought Ford used to have a reusable rubber gasket for the 8.8 in their performance parts catalog, but I can't find them now. It was probably over 10 years ago when I saw those.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 231K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 201K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 250K miles
Re: Differential sealing: gasket vs rtv [Re: The_Eric] #4097440 05/15/16 01:50 PM
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blupupher Offline
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Originally Posted By: The_Eric
RTV and drill/weld a fitting to drain.

If it is something you plan on changing often (4x4 or boat tow rig that may have water infiltration) I would do that, but really, how often do people actually change their fluid? Most vehicles probably go a lifetime and never have a rear end fluid change.
Also, depending on the vehicle, you may have quite a bit left in the diff with just a drain plug. I know the 9.75 in my truck has at least 1 cup (if not more) of fluid in the bottom of the diff when I take the cover off, a drain plug would leave even more since it would not be at the very bottom of the cover.

I have always used RTV with no issues, just make sure the cover and housing are clean and dry before you start.


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Re: Differential sealing: gasket vs rtv [Re: 01rangerxl] #4097444 05/15/16 01:59 PM
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bdcardinal Offline
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Originally Posted By: 01rangerxl
I have been thinking of getting a Lube Locker gasket for my 8.8 equipped truck. They say they are reusable, but I don't know anyone who has used one.

I thought Ford used to have a reusable rubber gasket for the 8.8 in their performance parts catalog, but I can't find them now. It was probably over 10 years ago when I saw those.


I have only seen the elastomeric gaskets on transmission pans. The FRPP diff covers I have ordered came with a gasket that was a thick rubbery paper style.


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Re: Differential sealing: gasket vs rtv [Re: buck91] #4098792 05/17/16 06:22 AM
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DoubleWasp Offline
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My Ram diffs have elastomeric gaskets, but I don't use them anymore after seeing how ineffective they are at keeping corrosion from working its way inward from the lip of the diff cover.

Gear oil RTV for me, and nothing else.


07 Lincoln Navigator M1 0w-40/FU
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Re: Differential sealing: gasket vs rtv [Re: buck91] #4099105 05/17/16 12:21 PM
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nobb Offline
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Using a gasket is a good idea, I think I'll get a bunch on my next RockAuto order. They are cheap anyways. I don't know why manufacturers cheap out on the drain plug. A 15 min drain/fill easily turns into a 2 hour job if RTV is involved.

Re: Differential sealing: gasket vs rtv [Re: bdcardinal] #4099457 05/17/16 06:34 PM
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01rangerxl Offline
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Originally Posted By: bdcardinal
Originally Posted By: 01rangerxl
I have been thinking of getting a Lube Locker gasket for my 8.8 equipped truck. They say they are reusable, but I don't know anyone who has used one.

I thought Ford used to have a reusable rubber gasket for the 8.8 in their performance parts catalog, but I can't find them now. It was probably over 10 years ago when I saw those.


I have only seen the elastomeric gaskets on transmission pans. The FRPP diff covers I have ordered came with a gasket that was a thick rubbery paper style.


I'm probably remembering it wrong...vague memory from a paper catalog about 12-13 years ago.

For the $25 or so, I will probably try a Lube Locker gasket next time and see how it does. I probably just need to go ahead and get a cover with a drain plug since the truck goes off road some (I wish more often).


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 231K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 201K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 250K miles
Re: Differential sealing: gasket vs rtv [Re: 01rangerxl] #4099943 05/18/16 08:52 AM
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4WD Offline
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Aftermarket covers up the odds of sealing with a gasket or sealer. I used G2 on an AAM860 (similar size) re useable gasket - and just dumped second time - held 3 qts Delvac Synthetic to the tattle tell plug level. Easy to drain/fill too ...
Only issue: The cap screws were about 3/16" short - so had to run to town ...

Re: Differential sealing: gasket vs rtv [Re: 4WD] #4099951 05/18/16 09:03 AM
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Canadastang Offline
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Bought a lubelocker gasket a couple years ago and haven't looked back.

Best $30 I ever spent.

Fill up the diff immediately, no waiting for RTV to cure.

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