What seals to replace while trans is out?
Thread Starter
Intermediate
Joined: Oct 2013
Posts: 44
Likes: 1
What seals to replace while trans is out?
I'm going to be removing my transmission in my 97 6 spd next weekend, and I'm having a tough time figuring out exactly what seals to order.
I know I need one output shaft seal p/n 88996703 and two differential side O-rings p/n 89047953.
Someone mentioned there is a big seal that goes between the transmission and differential too? and a rear cover seal? Hoping someone can clear this up and tell me what to buy
I know I need one output shaft seal p/n 88996703 and two differential side O-rings p/n 89047953.
Someone mentioned there is a big seal that goes between the transmission and differential too? and a rear cover seal? Hoping someone can clear this up and tell me what to buy
Melting Slicks
Joined: Jan 2008
Posts: 2,590
Likes: 48
From: Nathalie VA
St. Jude Donor '15-'16-'17-'18
There's an inner and outer OPS seal. You have to remove the extension housing to replace the inner one, and you'll need an extension housing gasket). I wouldn't replace them unless you have a known leak there (it will be obvious). If you do need them:
I can't find the part number for the extension housing gasket but Gene Culley at CULTRAG will be able to locate it for you. It was around $50
Output shaft seal (inner) 19206242
Output shaft seal (outer) 12455045
(make sure you note the orientation of these seals before removal. If you install them incorrectly they WILL leak).
What I would replace:
There is a large o-ring that goes on the extension housing 12369456
Get 2 o rings for the diff covers 89047953
get 2 axle seals for the diff covers 88996703
Rear cover o ring 89047954
I can't find the part number for the extension housing gasket but Gene Culley at CULTRAG will be able to locate it for you. It was around $50
Output shaft seal (inner) 19206242
Output shaft seal (outer) 12455045
(make sure you note the orientation of these seals before removal. If you install them incorrectly they WILL leak).
What I would replace:
There is a large o-ring that goes on the extension housing 12369456
Get 2 o rings for the diff covers 89047953
get 2 axle seals for the diff covers 88996703
Rear cover o ring 89047954
Last edited by CamminC5; Jan 14, 2016 at 10:05 PM.
Burning Brakes
Joined: Aug 2011
Posts: 1,071
Likes: 14
From: Odessa TX
There's an inner and outer OPS seal. You have to remove the extension housing to replace the inner one, and you'll need an extension housing gasket). I wouldn't replace them unless you have a known leak there (it will be obvious). If you do need them:
I can't find the part number for the extension housing gasket but Gene Culley at CULTRAG will be able to locate it for you. It was around $50
Output shaft seal (inner) 19206242
Output shaft seal (outer) 12455045
(make sure you note the orientation of these seals before removal. If you install them incorrectly they WILL leak).
What I would replace:
There is a large o-ring that goes on the extension housing 12369456
Get 2 o rings for the diff covers 89047953
get 2 axle seals for the diff covers 88996703
Rear cover o ring 89047954
I can't find the part number for the extension housing gasket but Gene Culley at CULTRAG will be able to locate it for you. It was around $50
Output shaft seal (inner) 19206242
Output shaft seal (outer) 12455045
(make sure you note the orientation of these seals before removal. If you install them incorrectly they WILL leak).
What I would replace:
There is a large o-ring that goes on the extension housing 12369456
Get 2 o rings for the diff covers 89047953
get 2 axle seals for the diff covers 88996703
Rear cover o ring 89047954
I would also add that it might be worthwhile to change the differential belleville washers. I found one of mine cracked, which I think is common, and went ahead and replaced them with C6 pieces. Requires a little more work and a press + a special tool (think I paid like $25 from eBay - will probably post mine for sale soon as I shouldn't ever need it again).
Used these threads as a guide
https://www.corvetteforum.com/forums...post1573407966
https://www.corvetteforum.com/forums...-z06-guts.html
Good luck.
Melting Slicks
Joined: Jan 2008
Posts: 2,590
Likes: 48
From: Nathalie VA
St. Jude Donor '15-'16-'17-'18
Burning Brakes
Joined: Aug 2011
Posts: 1,071
Likes: 14
From: Odessa TX
Melting Slicks
Joined: Jan 2008
Posts: 2,590
Likes: 48
From: Nathalie VA
St. Jude Donor '15-'16-'17-'18
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Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You need to be a little more educated with your differential construction. Here are a few post that will help you see what inside and how it works and some of the simple improvements that you can do while you have it out.
I did this to my differential and its doing excellent and easily supporting 450 RWHP driven hard.
I ordered almost ALL the upgrade parts from Gene Culley and he was excellent with helping me with the parts order and making sure I had all the correct parts.
I did order a DTE spider gear cross shaft as it a good bit more heavy duty than the OEM part.
Check out these post if not for anything more than to see what you need to order and how to best service the differential::
- C5, ragtopws6 , Upgrading your C5 rear with C6 Z06 guts, : http://forums.corvetteforum.com/c5-g...-z06-guts.html
-
- C5, Its_Go_Time, Output Shaft Install - Left and Right: http://forums.corvetteforum.com/c5-t...post1573407966
- C5, Its Go TIME, Differential Rebuild post: https://www.corvetteforum.com/forums...1&p=1591127325
- C5 Differential Seal replacement: http://forums.corvetteforum.com/c5-g...on-photos.html
-
I also included a manual transmission related post so you can see where those seals go:
- C5 ragtopws6, T-56 Build (whats in my tranny?) : http://forums.corvetteforum.com/nort...-smoother.html
I did this to my differential and its doing excellent and easily supporting 450 RWHP driven hard.
I ordered almost ALL the upgrade parts from Gene Culley and he was excellent with helping me with the parts order and making sure I had all the correct parts.
I did order a DTE spider gear cross shaft as it a good bit more heavy duty than the OEM part.
Check out these post if not for anything more than to see what you need to order and how to best service the differential::
- C5, ragtopws6 , Upgrading your C5 rear with C6 Z06 guts, : http://forums.corvetteforum.com/c5-g...-z06-guts.html
-
- C5, Its_Go_Time, Output Shaft Install - Left and Right: http://forums.corvetteforum.com/c5-t...post1573407966
- C5, Its Go TIME, Differential Rebuild post: https://www.corvetteforum.com/forums...1&p=1591127325
- C5 Differential Seal replacement: http://forums.corvetteforum.com/c5-g...on-photos.html
-
I also included a manual transmission related post so you can see where those seals go:
- C5 ragtopws6, T-56 Build (whats in my tranny?) : http://forums.corvetteforum.com/nort...-smoother.html
Thread Starter
Intermediate
Joined: Oct 2013
Posts: 44
Likes: 1
Is there anything special that needs to be done to remove that extension housing? I know the diff bolts right off it, but to re-seal the extension housing to gearbox seal... does it simply side off, or is it more in depth than that?
I also can't seem to figure out if Dextron 5 is compatible for the transmission fluid.. No one sells Dextron 3 anymore.
I also can't seem to figure out if Dextron 5 is compatible for the transmission fluid.. No one sells Dextron 3 anymore.
Last edited by Tim1137; Jan 21, 2016 at 11:31 AM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The extension housing simply unbolts and slides off. IMHO, I would order some AMSOIL Torque Drive ATF. It compatible with your early Transmission paper backed blocker rings and it a MUCH better oil than the OEM Grade DINO fluid.
There are several Forum Sponsor AMS OIL Dealers on here. Give them a shout and discuss your needs..
There are several Forum Sponsor AMS OIL Dealers on here. Give them a shout and discuss your needs..
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The MN6/MN12 transmission requires FOUR quarts when its DRY (new from the factory)
When you drain the fluid and refill the transmission, it will only take 3.75 quarts. SO, you will always have a little left over when you are done the refill job!
http://www.c66racing-synthetics.com/ has AMSOIL supplies as well as forum member SUBDRIVER
When you drain the fluid and refill the transmission, it will only take 3.75 quarts. SO, you will always have a little left over when you are done the refill job!
http://www.c66racing-synthetics.com/ has AMSOIL supplies as well as forum member SUBDRIVER
Supporting Vendor
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From: Frederick Maryland
St. Jude Donor '08-'09-'10-'11-'12, '14-'15-'16-'17-'18
