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#1
02-09-2024, 07:00 PM
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transmission leak at driveshaft seal
Guys I have looked this up on a few forums, however I am not sure if this is the same problem. I have transmission leak around the outer seal of my th400 transmission. The leak is not where the yoke of the drive shaft slides inthe transmission but the outside perimeter of where the seal meets the th400 rear housing.. I have included a picture for a better reference. This is a new build and only 100 miles on this set up. Any idesa on how to fix this?
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#2
02-09-2024, 07:30 PM
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Permatex flange sealer. U smear a light film of it around the outer surface of the metal face of seal that get pushed into the tail stock…….helps seal any small voids
__________________
 1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's
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#3
02-09-2024, 07:31 PM
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What he said.
__________________
"At no time did we exceed 175 mph.” Dan Gurney's truthful response to his and Brock Yate's winning of the first ever Cannonball Baker Sea-to-Shining Sea... Still have my 1st Firebird 7th Firebird 57 Starchief |
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#4
02-09-2024, 07:47 PM
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Oh, okay, i will give that a shot. Big thanks!
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#5
02-09-2024, 08:52 PM
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I do that with all seals of that type actually. It not only insures the sealing action but lubes it a bit for easier installation.
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Greg Reid Palmetto, Georgia |
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#6
02-09-2024, 09:55 PM
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This looks to be something I've really needed in my garage for sometime. Appreciate the advice.
https://www.permatex.com/products/ga...sealant-50-ml/
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"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
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#7
02-09-2024, 10:29 PM
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Yup, had to do that on my old TH400 as well. Have to remove the seal, smear the flange with sealer, and reinstall. Over time the finish on the bore degrades from corrosion and seal replacement. The seal itself just doesn't seal as well as it once did when the transmission tail housing was new.
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-Jason 1969 Pontiac Firebird |
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#8
02-10-2024, 05:03 AM
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I never install a seal like that dry, I normally use silicone but the Permatex flange seal may be better suited. I also lightly sand the mating surface of the seal. I do the same when installing freeze plugs.
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Tim Corcoran |
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#9
02-10-2024, 09:52 AM
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Today I learned....
Good stuff |
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#10
02-10-2024, 10:37 AM
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I usually use a thin application of permatex #2 on the id and od of seals like that..... the exact product matters less than the fact of using something at all
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A man who falls for everything stands for nothing. |
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#11
02-10-2024, 11:56 AM
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Quote:
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 71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. Last edited by 67drake; 02-10-2024 at 12:08 PM. |
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#12
02-10-2024, 01:33 PM
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Couldn’t find anything specifically marked “flange sealer” from Permatex. Is this it?
Says good for aluminum and cast iron flanges
__________________
71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
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#13
02-10-2024, 04:39 PM
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Anaerobic sealers work good in this application
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If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
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#14
02-10-2024, 06:06 PM
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Quote:
Thanks
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71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
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#15
02-11-2024, 12:12 AM
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That should be fine.
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Greg Reid Palmetto, Georgia |
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#16
02-11-2024, 11:05 AM
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Quote:
__________________
1973 Firebird Navajo Orange w/shaker,1973 400/461,1972 Intake SD CNC'd,1977 Q-Jet 800 CFM w/ Cliffs Kit,Tanks Inc PA4 255 Walbro intank pump ,-8an feed/return,RobbMc Regulator,RobbMc 40 micron filter,253 CFM 6x-8's w/H.S 1:5 Roller Rockers,SD Stump Puller H/R Cam 230/236 @.050 112 lobe separation 565/.570 lift,Crower Solid Rollers,28150 Hedman Headers,3" exhaust,full tailpipes,350 Turbo,9.5" 3200 Converter,3:42 gear,8.5 posi,C/E slide-alinks,Koni adj frt shocks,Best 12.18@110.55 Lookin for 11's
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#17
02-11-2024, 04:16 PM
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#18
02-11-2024, 06:46 PM
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Wow... they're proud of that stuff!
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Greg Reid Palmetto, Georgia |
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