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#1403828 - 03/15/09 12:34 PM Sealant for transmission and rear differential
matrass Offline


Registered: 11/05/04
Posts: 1288
Loc: Pa
Was wondering what you guys are using for sealing up the transmission and rear differential .


Looking at the Permatex site and it can get confusing to say the least.

Wondering if the Permatex right stuff 1 minute gasket maker would be my best choice for both.

Figure the rear differential will be easy to get the sealant applied to and ready for install but will

I have enough time to get the transmission pan in place and bolts torqued down ( site says 5 minutes )

Also curious as to what product you all would suggest to clean the pan and differential covers with

before applying sealant.


Last but not least, what side are you applying the sealant to ?

The trans filter kit comes with a gasket but should I apply sealant on top of gasket, then install pan back on housing or apply sealant then gasket them mate to transmission housing ? want to make this as easy as I can while keeping the gasket in place so all of the holes line up. thanks for your thoughts

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#1403839 - 03/15/09 12:44 PM Re: Sealant for transmission and rear differential [Re: matrass]
mstrjon32 Offline


Registered: 05/27/03
Posts: 1565
Loc: Elkridge, MD
My vehicles use either a reusable gasket or a drain/fill plus on the transmission, so I don't use anything there.

For my front/rear diff's I just use a tube of Permatex Black RTV maker. Apply around the perimeter and each bolt hole of the cover, mate it up, bolt it up, wait about 10 minutes, fill it up and you're done. I hit the cover with the wire wheel which makes quick work of cleaning up the old gasket material and do the diff itself with either a manual wire brush or a wire brush on the air drill. Stick a rag in there first to keep all the [censored] from getting in the diff. Never had a leak. No nasty chemicals necessary.

I do clean out the inside of the cover in the parts washer, or just use brake cleaner.

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#1403840 - 03/15/09 12:45 PM Re: Sealant for transmission and rear differential [Re: matrass]
AzFireGuy79 Offline


Registered: 03/08/08
Posts: 1286
Loc: Arizona
I have used the Right stuff many times on transmission pans. It doesnt fully cure in 1 minute so you have some time to apply it and then put it into place. I discard the gasket as there is no need for it when using this product. I apply the Right stuff to the pan. Assure everything is clean and re-torque to specs. This stuff is great. I have never had a leak in any diffs or transmissions where it was utilized.

Also, I use Brakleen to assure any oil has been removed.


Edited by AzFireGuy79 (03/15/09 12:47 PM)
_________________________
2008 Chevrolet 2500HD 6.6 DMAX, CCSB,Z71
2011 JEEP Grand Cherokee Overland HEMI 5.7

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#1403850 - 03/15/09 12:54 PM Re: Sealant for transmission and rear differential [Re: AzFireGuy79]
tig1 Offline


Registered: 01/03/09
Posts: 12755
Loc: Illinois
For the diff use Permatex Ultra Black, and for the tranny do not use any sealant with the gasket, and be very careful not to over torque the pan bolts.

Also after you re-install the diff cover let it set a couple of hours before filling with gear oil.
_________________________
2007 Ford Fusion 213,000 miles
M1 0-20 AFE
2017 Ford Fusion 33K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#1403852 - 03/15/09 12:57 PM Re: Sealant for transmission and rear differential [Re: tig1]
oilboy123 Offline


Registered: 12/05/03
Posts: 6941
Loc: Everett, Washington
I just saw some RTV specially made for trans/diff. I can't remember where I saw it or what brand it was.

I have used Permatex Copper without any problems.
_________________________
“Loyalty to country ALWAYS. Loyalty to government, when it deserves it.”
― Mark Twain







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#1403869 - 03/15/09 01:05 PM Re: Sealant for transmission and rear differential [Re: oilboy123]
01rangerxl Offline


Registered: 04/08/06
Posts: 9126
Loc: Birmingham, AL
On differential covers I always use Permatex Ultra Black. It cures pretty quick and won't leak.
_________________________
2002 Ford Ranger XLT | 3.0 V6 / 5-Speed Automatic / 2WD | 200K miles
1994 Ford Ranger STX | 4.0 V6 / 5-Speed Manual / 4X4 | 190K miles

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#1403899 - 03/15/09 01:36 PM Re: Sealant for transmission and rear differential [Re: 01rangerxl]
eljefino Online   content


Registered: 06/15/03
Posts: 31365
Loc: ME
Permatex makes a non-ultra black RTV too. Without surprise, it's available at walmart. Has the viscosity of kid's toothpaste and the stickiness of teflon.

I usually apply the RTV to the part that removes, in your case the trans pan. (Couldn't imagine doing it upside down, to the tranny!) Sometimes it has a nice channel to hold the goo in. Be careful around bolt holes that you don't have so much it goes in over the tip of bolts, hydro-locking them.

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#1403904 - 03/15/09 01:45 PM Re: Sealant for transmission and rear differential [Re: eljefino]
dave123 Offline


Registered: 01/13/09
Posts: 2009
Loc: wi
+1 for Right Stuff

+2 for Right Stuff

+3 For Right Stuff

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#1403908 - 03/15/09 01:50 PM Re: Sealant for transmission and rear differential [Re: eljefino]
matrass Offline


Registered: 11/05/04
Posts: 1288
Loc: Pa
Thanks for the suggestions so far everybody. sounds like I will pick up the Permatex black black for the rear diff. does the black permatex hold up well to synthetic gar lube like Amsoil. I do have a gasket with the trans filter kit but it is of a cork type material. thought I read on here that the cork material is not as good for sealing. guess I could use a dab or two of the Permatex black to keep the gasket in place while I am installing it. I bought an AC/Delco trans filter kit to fit on my Trailblazer. found out that there are two different kinds of pans, a deep and a shallow pan. any tell tale signs of which pan is on my 2002 trailblazer? maybe I need to measure the depth of the pan while it is mounted? bought the kit at Advanced Auto and they only had the one model number, Rock Auto lists both models.

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#1403926 - 03/15/09 02:25 PM Re: Sealant for transmission and rear differential [Re: matrass]
c3po Offline


Registered: 01/24/08
Posts: 3358
Loc: Maryland
I am using the Red RTV on my Differential with the Amsoil Lube, but the Black RTV is fine, just stay away from the Blue RTV.

After I put the diff cover on and tighten down the bolts I like to put a bead of silicone around the cover where it meets the differential.

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#1403974 - 03/15/09 03:07 PM Re: Sealant for transmission and rear differential [Re: c3po]
tig1 Offline


Registered: 01/03/09
Posts: 12755
Loc: Illinois
Yes the Ultra Black will hold up well with synt gear lubes. Just let it cure for a couole of hours before re- filling. Acouple of dabs of sealer on the tranny gasket won't hurt just to keep it aliegned.
_________________________
2007 Ford Fusion 213,000 miles
M1 0-20 AFE
2017 Ford Fusion 33K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#1404015 - 03/15/09 03:54 PM Re: Sealant for transmission and rear differential [Re: tig1]
demarpaint Offline


Registered: 07/03/05
Posts: 28127
Loc: NY
I've used gaskets for both apps since that's what my cars/trucks had. I make sure everything is clean then wipe it down with brake-clean. I spray Permatex Hi-Tack spray on both surfaces, then both sides of the gasket and seat the gasket. Then I put everything together, let is sit about an hour before adding oils or fluids, no leaks doing it that way for me. JMO
_________________________
God Bless Our Troops


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#1404190 - 03/15/09 06:31 PM Re: Sealant for transmission and rear differential [Re: demarpaint]
doitmyself Offline


Registered: 06/03/02
Posts: 5877
Loc: MI
For what it's worth (not much), I spoke with the Permatex guys a few years ago looking for a "better" RTV sealant for a unique application. Back then, they told me the Ultra black was one of their "best" RTVs and was much better than the plain black/blue etc.. The Ultra Black had better adhesion/leak sealing properties, temp. resistance, and on and on.

There's lots of opinions on gaskets and sealants. The Right Stuff intrigues me. There are gasket dressings like the Hi Tack dermapaint mentions and stand alone sealers like the RTV. I was taught to use most gaskets without anything (Felpro often says this)unless you have problematic mating surfaces. I was also taught not to use RTV with a gasket, but I know others that do.

The Felpro tranny gaskets are superb. I don't like cork ones because they are too easy to squeeze out.

To each his own.

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#1404197 - 03/15/09 06:36 PM Re: Sealant for transmission and rear differential [Re: doitmyself]
GMBoy Offline


Registered: 11/22/04
Posts: 7438
Loc: Texas
I've always used Permatex copper Hi-temp. Yeah, a little overkill but never failed me like the black or blue types. It is a bit more chemical resistant than those, too.

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#1404352 - 03/15/09 08:55 PM Re: Sealant for transmission and rear differential [Re: GMBoy]
oilboy123 Offline


Registered: 12/05/03
Posts: 6941
Loc: Everett, Washington
 Originally Posted By: GMBoy
I've always used Permatex copper Hi-temp. Yeah, a little overkill but never failed me like the black or blue types. It is a bit more chemical resistant than those, too.


+1
I can't see the black being any better. Copper would be better I would think.
_________________________
“Loyalty to country ALWAYS. Loyalty to government, when it deserves it.”
― Mark Twain







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