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Transmission Pan Gasket? #5116019 05/26/19 06:12 AM
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mctmatt Offline OP
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Did a pan drop yesterday on my 07 flex fuel Impala. Put in 7 quarts of Castrol Dex VI along with Lubriguard Red and I think the Impala appreciated it. I exchanged the filter with a Hasting premium but the rubber gasket seemed very flimsy and was difficult to work with . Curiouser what gaskets others prefer be it rubber, cork, or whatever form you like.

Re: Transmission Pan Gasket? [Re: mctmatt] #5116025 05/26/19 06:18 AM
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atikovi Offline
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RTV. Superior to any gasket you can use.

Re: Transmission Pan Gasket? [Re: mctmatt] #5116083 05/26/19 07:18 AM
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demarpaint Offline
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I use a gasket and this: High Tack It has never let me down, and gasket removal for future pan drops or filter changes are very easy. I was never a big fan of RTV, unless it had to be used as a last resort. Opinions vary.


God Bless Our Troops

Re: Transmission Pan Gasket? [Re: atikovi] #5116091 05/26/19 07:26 AM
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Mad_Hatter Offline
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Originally Posted by atikovi
RTV. Superior to any gasket you can use.


What he 🖕said. I just did my valve covers with permatex ultra black and zero leaks.

Re: Transmission Pan Gasket? [Re: mctmatt] #5116123 05/26/19 07:53 AM
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Trav Offline
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If this is the 4T65E the best gasket is the reusable one you took off, you can reuse that one a few times. The floppy rubber ones with the filter kits are not very good, the OE is rubber coated steel. RTV is my least favorite gasket material, I don't use it for much anymore, it is inferior to a physical gasket in almost every application.
The last time I used it was for the intake ends on a GM 3400. If a gasket is available I use it with a little High Tack Demarpaint mentioned.


ASE L1, Master. Deutsch Meisterbrief.
Re: Transmission Pan Gasket? [Re: mctmatt] #5116129 05/26/19 07:59 AM
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nobb Offline
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RTV is only for stuff you never want to take off ever again. For something like a transmission pan where you want to service regularly, then you'll want to go with a gasket.

Re: Transmission Pan Gasket? [Re: Trav] #5116138 05/26/19 08:12 AM
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mctmatt Offline OP
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Trav just to let you know I did reuse the OEM gasket that was on the pan as it was still in good shape and much easier to work with when laying under the car trying to line up and bolt in the pan, RTV I would think make that difficult keeping the pan aligned without messing up what you applied.

Last edited by mctmatt; 05/26/19 08:13 AM.
Re: Transmission Pan Gasket? [Re: Trav] #5116139 05/26/19 08:12 AM
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demarpaint Offline
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Originally Posted by Trav
If this is the 4T65E the best gasket is the reusable one you took off, you can reuse that one a few times. The floppy rubber ones with the filter kits are not very good, the OE is rubber coated steel. RTV is my least favorite gasket material, I don't use it for much anymore, it is inferior to a physical gasket in almost every application.
The last time I used it was for the intake ends on a GM 3400. If a gasket is available I use it with a little High Tack Demarpaint mentioned.

thumbsup


God Bless Our Troops

Re: Transmission Pan Gasket? [Re: mctmatt] #5116144 05/26/19 08:19 AM
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Mad_Hatter Offline
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Originally Posted by mctmatt
Trav just to let you know I did reuse the OEM gasket that was on the pan as it was still in good shape and much easier to work with when laying under the car trying to line up and bolt in the pan, RTV I would think make that difficult keeping the pan aligned without messing up what you applied.


Take one of the bolts to your local hardware store and find a bolt or threaded rod with the same pitch and diameter. The idea is to make 2 or 3 lugs to put in the pan holes. You may need a hacksaw and file to deburr. Once you put the lugs in, put the pan back on and go around in a star pattern hand tightening bolts, once you get to one of the lugs you put in, take it out w/pliars and replace it with the bolt.

This is how I put my oil pan on using gasket maker, laying on my back under the car. Easy peasy, lemon squeezy

Last edited by Mad_Hatter; 05/26/19 08:34 AM.
Re: Transmission Pan Gasket? [Re: mctmatt] #5116145 05/26/19 08:19 AM
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I like the gaskets that are some sort of compressed cardboard. Never had one leak in 30+ years of using them. Make sure to beat the pan straight if needed.


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Re: Transmission Pan Gasket? [Re: atikovi] #5116151 05/26/19 08:26 AM
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Lubener Offline
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Originally Posted by atikovi
RTV. Superior to any gasket you can use.

Never use RTV for a transmission pan gasket. Once the excess is squeezed out, it will wind up caught in the filter. Any impurity on the surfaces and that RTV won't stick. Good luck if you ever had to tweek the pan bolts, it won't work. Best bet is get an OEM gasket, it likely will be reusable.

Last edited by Lubener; 05/26/19 08:31 AM.

The "thinking" man's friend.
Re: Transmission Pan Gasket? [Re: Lubener] #5116164 05/26/19 08:42 AM
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Mad_Hatter Offline
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Originally Posted by Lubener
[quote=atikovi]RTV. Superior to any gasket you can use.

Never use RTV for a transmission pan gasket. Once the excess is squeezed out, it will wind up caught in the filter. Any impurity on the surfaces and that RTV won't stick./quote]

Not if you a) don't over apply and b) let it cure for 24hrs before adding fluid and c) use a wire brush and brake cleaner. It's not like Niagra falls in your transmission or as if you have little gnomes in there hammering away. Once that stuff sets, it ain't going anywhere. And Permatex actually makes an anaerobic gasket maker that comes off relatively easy, where nothing more than a steady hand and a putty knife gets it open. It's specifically designed for use on oil/transaxle pans where servicing is required.

The nice advantage of a set in place gasket maker is it will fill in any undulations or surface imperfections in the pan, something preformed can't do.

Last edited by Mad_Hatter; 05/26/19 08:46 AM.
Re: Transmission Pan Gasket? [Re: mctmatt] #5116197 05/26/19 09:13 AM
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Nobody mentioned Felpro gaskets. Besides a quality OEM one, Felpro tranny gaskets tend to be very stout. They are made of a very dense composite rubber material and come packaged flat in a box. I prefer a gasket in most situations of repair work.

Re: Transmission Pan Gasket? [Re: Mad_Hatter] #5116218 05/26/19 09:38 AM
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Trav Offline
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Originally Posted by Mad_Hatter
Originally Posted by Lubener
[quote=atikovi]RTV. Superior to any gasket you can use.

Never use RTV for a transmission pan gasket. Once the excess is squeezed out, it will wind up caught in the filter. Any impurity on the surfaces and that RTV won't stick./quote]

Not if you a) don't over apply and b) let it cure for 24hrs before adding fluid and c) use a wire brush and brake cleaner. It's not like Niagra falls in your transmission or as if you have little gnomes in there hammering away. Once that stuff sets, it ain't going anywhere. And Permatex actually makes an anaerobic gasket maker that comes off relatively easy, where nothing more than a steady hand and a putty knife gets it open. It's specifically designed for use on oil/transaxle pans where servicing is required.

The nice advantage of a set in place gasket maker is it will fill in any undulations or surface imperfections in the pan, something preformed can't do.


Who has 24hrs to leave it? That would really jam up the works if you work on multiple cars a day.


ASE L1, Master. Deutsch Meisterbrief.
Re: Transmission Pan Gasket? [Re: Trav] #5116225 05/26/19 09:46 AM
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RyanY Offline
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Originally Posted by Trav
Originally Posted by Mad_Hatter
Originally Posted by Lubener
[quote=atikovi]RTV. Superior to any gasket you can use.

Never use RTV for a transmission pan gasket. Once the excess is squeezed out, it will wind up caught in the filter. Any impurity on the surfaces and that RTV won't stick./quote]

Not if you a) don't over apply and b) let it cure for 24hrs before adding fluid and c) use a wire brush and brake cleaner. It's not like Niagra falls in your transmission or as if you have little gnomes in there hammering away. Once that stuff sets, it ain't going anywhere. And Permatex actually makes an anaerobic gasket maker that comes off relatively easy, where nothing more than a steady hand and a putty knife gets it open. It's specifically designed for use on oil/transaxle pans where servicing is required.

The nice advantage of a set in place gasket maker is it will fill in any undulations or surface imperfections in the pan, something preformed can't do.


Who has 24hrs to leave it? That would really jam up the works if you work on multiple cars a day.


^this.
I always use OEM gasket if available, or Felpro if the OEM price is too high. Both are top notch. Other brands may be fine but rarely much lower price than felpro. I would consider RTV only as a last resort, for the reasons mentioned above.


2007 Cadillac CTS 3.6L >127k miles (Castrol Magnatec 5W-30 + ACDelco PF2129G)

2012 Honda Odyssey EX-L >103k miles (Pennzoil Platinum 0W-20 + Fram XG7317)
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