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Transmission pan gasket silicone? #4777368
06/04/18 03:42 PM
06/04/18 03:42 PM
Joined: Apr 2017
Posts: 929
SF BAY AREA, CA
dogememe Offline OP
dogememe  Offline OP
Joined: Apr 2017
Posts: 929
SF BAY AREA, CA
About to put aftermarket pans with drain plugs on both the Burb and the Vic. The instructions for both vehicles tranny filter kits specifically state not to re-use the gasket and not to use any type of gasket maker or silicone. When I did the tranny filter (but forgot to put my new pan on) on the Suburban like a month ago I actually re-used the old gasket that was very stuck on the stock pan and didn't use any sealer, and it's not leaking.

I'm going to be doing the one on the Suburban myself but I'm going to be having a shop do the one on the Vic (but I will be supplying all the parts and fluids) and I'm just wondering whether I really should avoid the silicone, or should use it. Thanks.


2007 Crown Vic P71 4.6 ~126K Miles, Royal Purple HPS 5W-30, Royal Purple Filter, Daily Driver, 5K OCIs.
2010 Escape FWD 2.5 ~84K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo, 10-15K OCIs.
Re: Transmission pan gasket silicone? [Re: dogememe] #4777370
06/04/18 03:44 PM
06/04/18 03:44 PM
Joined: Jan 2007
Posts: 2,531
Oneida County, NY
rsylvstr Offline
rsylvstr  Offline
Joined: Jan 2007
Posts: 2,531
Oneida County, NY
Iíve used black RTV on all of the vehicles I have worked on.


2013 F150 SCrew Lariat 4X4 5.0 3.55
2012 Altima SL that still vibrates.
2018 Polaris Sportsman 850 SP. Polaris fluids and filter.
Re: Transmission pan gasket silicone? [Re: dogememe] #4777373
06/04/18 03:47 PM
06/04/18 03:47 PM
Joined: Nov 2003
Posts: 3,791
Cape Cod, MA
RF Overlord Offline
RF Overlord  Offline
Joined: Nov 2003
Posts: 3,791
Cape Cod, MA
If you look at the bottom of the pan on your Crown Vic, you'll see that it states that the pan gasket is designed to be reused. Dunno about the Suburban.


Supercharged '03 Mercury Marauder - Trilogy Motorsports #61
PP 5W-30 / MC FL820S

'04 Grand Marquis LS Limited Edition - daily driver

'00 Grand Marquis GS - bad frame/future to be determined
Re: Transmission pan gasket silicone? [Re: dogememe] #4777399
06/04/18 04:07 PM
06/04/18 04:07 PM
Joined: Jun 2005
Posts: 11,323
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,323
Santa Barbara, CA
No RTV needed on the Vic. That is a reusable elastomeric gasket on the pan. The part number is F2VY-7A191-A.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: Transmission pan gasket silicone? [Re: dogememe] #4777422
06/04/18 04:24 PM
06/04/18 04:24 PM
Joined: Jan 2004
Posts: 4,146
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,146
California
If the OEM gasket is still there and hasn't been mangled with via overtorquing, it can be reused.

I generally don't like RTV on tranny pans unless it's specifically called for. I've used Toyota black FIPG or Permatex's Ultra Black in place of the former's esoteric almost $100/tube red FIPG for transmissions when I had to use it.

Re: Transmission pan gasket silicone? [Re: dogememe] #4777428
06/04/18 04:31 PM
06/04/18 04:31 PM
Joined: Oct 2012
Posts: 68
ID - Idaho
natenkiki2004 Offline
natenkiki2004  Offline
Joined: Oct 2012
Posts: 68
ID - Idaho
If it was me, I wouldn't re-use and wouldn't use a cork gasket. Been burned on that on my own vehicles, currently with a leaking cork gasket even after following directions. I plan to take the pan off and super clean it then slap it back on with some Permatex The Right Stuff and only ever change the Magnefine filter I have on it. The fluid isn't under pressure and most pans that I've seen have a divot or channel to help hold the gasket in place, it should do the same for the RTV should you decide to use it.

Tranny fluid is a lot thinner than gear oil but I was super impressed when I had to take off a diff cover I had put on with The Right Stuff. What a miserable 45 minutes that was, it was STUCK on there good.

Last edited by natenkiki2004; 06/04/18 04:32 PM.

1991 Ford Explorer 4.0L OHV @ 229k miles
M1 Full Syn HM 5w30, M1 Syn 75w90 in front & rear diff, Valvoline MaxLife Syn ATF in t-case & trans.
Re: Transmission pan gasket silicone? [Re: nthach] #4777462
06/04/18 05:02 PM
06/04/18 05:02 PM
Joined: Apr 2017
Posts: 929
SF BAY AREA, CA
dogememe Offline OP
dogememe  Offline OP
Joined: Apr 2017
Posts: 929
SF BAY AREA, CA
Originally Posted By: nthach
If the OEM gasket is still there and hasn't been mangled with via overtorquing, it can be reused.

I generally don't like RTV on tranny pans unless it's specifically called for. I've used Toyota black FIPG or Permatex's Ultra Black in place of the former's esoteric almost $100/tube red FIPG for transmissions when I had to use it.


Thing is I'm replacing the pans on both vehicles, so I'd have to scrape off the old gasket from the pan (at least on the Burb the gasket was very stuck to the pan which is why I reused it and didn't use the new gasket but this time I'm changing the pan, and I doubt the old gasket would survive.


2007 Crown Vic P71 4.6 ~126K Miles, Royal Purple HPS 5W-30, Royal Purple Filter, Daily Driver, 5K OCIs.
2010 Escape FWD 2.5 ~84K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo, 10-15K OCIs.
Re: Transmission pan gasket silicone? [Re: dogememe] #4777599
06/04/18 07:47 PM
06/04/18 07:47 PM
Joined: Oct 2014
Posts: 588
On the road Midwest
Ihatetochangeoil Offline
Ihatetochangeoil  Offline
Joined: Oct 2014
Posts: 588
On the road Midwest
Originally Posted By: dogememe
Originally Posted By: nthach
If the OEM gasket is still there and hasn't been mangled with via overtorquing, it can be reused.

I generally don't like RTV on tranny pans unless it's specifically called for. I've used Toyota black FIPG or Permatex's Ultra Black in place of the former's esoteric almost $100/tube red FIPG for transmissions when I had to use it.


Thing is I'm replacing the pans on both vehicles, so I'd have to scrape off the old gasket from the pan (at least on the Burb the gasket was very stuck to the pan which is why I reused it and didn't use the new gasket but this time I'm changing the pan, and I doubt the old gasket would survive.


I got this idea from a buddy of mine who used to be a (Kawasaki dealer) motorcycle mechanic; I've been doing it for years as a matter of convenience. Use a new/old gasket (clean) and sparingly rub both sides with lithium or silicon grease. If future disassembly becomes necessary, said disassembly will be greatly simplified and the gasket will be reusable. Nothing I've ever done this to (valve covers, oil pans, trans pans, timing chain covers, water pumps), etc., has ever leaked.



2003 Lesabre
2004 Lesabre
2004 Impala
If ur NOT doing UOA then you're throwing away good oil or your engine is already damaged. Choose.
Re: Transmission pan gasket silicone? [Re: dogememe] #4777601
06/04/18 07:48 PM
06/04/18 07:48 PM
Joined: Dec 2013
Posts: 2,183
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,183
Fort Worth, Texas
On the 4L60E.....Use GM part# 8654799.


GM & Ford DO NOT use silicone sealants on ANY of their rear wheel drive automatic transmissions!!!


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto
Re: Transmission pan gasket silicone? [Re: Ihatetochangeoil] #4777632
06/04/18 08:07 PM
06/04/18 08:07 PM
Joined: Dec 2013
Posts: 2,183
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,183
Fort Worth, Texas
Originally Posted By: Ihatetochangeoil

I got this idea from a buddy of mine who used to be a (Kawasaki dealer) motorcycle mechanic; I've been doing it for years as a matter of convenience. Use a new/old gasket (clean) and sparingly rub both sides with lithium or silicon grease. If future disassembly becomes necessary, said disassembly will be greatly simplified and the gasket will be reusable. Nothing I've ever done this to (valve covers, oil pans, trans pans, timing chain covers, water pumps), etc., has ever leaked.


DO NOT use any kind of lubricant on a OEM 4L60E gasket......The gasket will squirm around & split along the bolt holes long before the correct bolt torque is achieved (120-144 Inch Pounds).
The gasket has resins that leach out at operating temps effectively bonding to the pan & trans case to create a leak free seal.
The gasket is Cheap at $7.00-$8.00 & easily removed from the pan with a heat gun.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto
Re: Transmission pan gasket silicone? [Re: clinebarger] #4777662
06/04/18 08:40 PM
06/04/18 08:40 PM
Joined: Oct 2014
Posts: 588
On the road Midwest
Ihatetochangeoil Offline
Ihatetochangeoil  Offline
Joined: Oct 2014
Posts: 588
On the road Midwest
Originally Posted By: clinebarger
On the 4L60E.....Use GM part# 8654799.


GM & Ford DO NOT use silicone sealants on ANY of their rear wheel drive automatic transmissions!!!


Sorry if I posted misinformation for your situation. All I've owned for 20+ years is FWD GM; transmission 4t65e, the gasket will NOT split if torqued to 120 in/lbs and is very reusable. I have a lot of zzperformance parts on my vehicle: https://zzperformance.com/3800/gaskets-adhesives/transmission-pan-gasket

All three of my vehicles have 4t65e transmissions, zzperformance transmission pans with drain plugs, https://zzperformance.com/3800/transmission-drivetrain/4t65e-aluminum-transmission-pan and silicon grease on the pan gaskets for 7+ years. No leaks. Guess this may not apply to the OP, but it works for me.



2003 Lesabre
2004 Lesabre
2004 Impala
If ur NOT doing UOA then you're throwing away good oil or your engine is already damaged. Choose.
Re: Transmission pan gasket silicone? [Re: dogememe] #4777997
06/05/18 09:38 AM
06/05/18 09:38 AM
Joined: Jan 2008
Posts: 3,972
Guilford, CT
exranger06 Offline
exranger06  Offline
Joined: Jan 2008
Posts: 3,972
Guilford, CT
No need for silicone. The whole purpose of a gasket is to prevent leaks. It's designed to do just that all on its own. Let the gasket do its job.


2006 Ford Ranger Sport
1992 Honda Accord EX
2004 Honda CR-V LX
1994 Ford Bronco XLT (project)
2011 Cadillac Escalade ESV (wife's)
Re: Transmission pan gasket silicone? [Re: dogememe] #4778054
06/05/18 10:51 AM
06/05/18 10:51 AM
Joined: Apr 2017
Posts: 929
SF BAY AREA, CA
dogememe Offline OP
dogememe  Offline OP
Joined: Apr 2017
Posts: 929
SF BAY AREA, CA
Thank you, no silicone used, Suburban doesn't leak.


2007 Crown Vic P71 4.6 ~126K Miles, Royal Purple HPS 5W-30, Royal Purple Filter, Daily Driver, 5K OCIs.
2010 Escape FWD 2.5 ~84K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo, 10-15K OCIs.
Re: Transmission pan gasket silicone? [Re: dogememe] #4778140
06/05/18 12:40 PM
06/05/18 12:40 PM
Joined: Jan 2004
Posts: 4,146
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,146
California
Originally Posted By: dogememe
Originally Posted By: nthach
If the OEM gasket is still there and hasn't been mangled with via overtorquing, it can be reused.

I generally don't like RTV on tranny pans unless it's specifically called for. I've used Toyota black FIPG or Permatex's Ultra Black in place of the former's esoteric almost $100/tube red FIPG for transmissions when I had to use it.


Thing is I'm replacing the pans on both vehicles, so I'd have to scrape off the old gasket from the pan (at least on the Burb the gasket was very stuck to the pan which is why I reused it and didn't use the new gasket but this time I'm changing the pan, and I doubt the old gasket would survive.

AFAIK, GM was starting to use reusable gaskets in the 1990s and so was Ford. Unless it was worked on before and glued in place or the person who rebuilt it used a cork gasket.

In that case, better safe(new gasket) than sorry.


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