Differential Compatability
Thread Starter
Pro
Joined: Nov 2001
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From: Albuquerque NM
Differential Compatability
I had a mechanic put a rear end from a 2002 (3.15 ratio) into my 1999 which had the stock 2.76 (or 2.73) rearend. He said my old one had a seal but the new one doesn't have a place for it. Now it leaks at the tranny junction. Anyone know of differences in the Getrag rearends? C5-Tech?
Le Mans Master
Joined: Jul 1999
Posts: 5,005
Likes: 38
From: jackson nj
Re: Differential Compatability (Vettepartz)
There is no difference. The seal he speaks of (actually an "O" ring) is on the transmission, not the rear. The rear has axle shaft seals, but they on on the side, not at the juncture of the rear to trans. This was a problem I had when my 3.42's were installed. :yesnod:
Team Owner
Joined: Apr 2001
Posts: 54,204
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From: S.W. Ohio. . . . . . NRA Life Member
Re: Differential Compatability (Red98C5)
I wonder what specific seal he was refering to?
There is a 6" aluminum disk that contains a seal which sits between the carrier and transmission. New carriers purchased as a GM replacement part do not come with this seal installed. You either have to remove it from the old carrier (not an easy task) or buy the seal as an additional part.
here is a pic of this seal:
In this pic, the seal is directly facing the camera and is still installed... so it is somewhat hard to picture the seal by itself. But it is not just the 2" diameter rubber part in the center; it's the entire 6" aluminum disk which the rubber seal is an intergal part of the disk.
I got a feeling they did not transfer over the seal from the old carrier, nor did they place a brand new seal in the new carrier.
There is a 6" aluminum disk that contains a seal which sits between the carrier and transmission. New carriers purchased as a GM replacement part do not come with this seal installed. You either have to remove it from the old carrier (not an easy task) or buy the seal as an additional part.
here is a pic of this seal:
In this pic, the seal is directly facing the camera and is still installed... so it is somewhat hard to picture the seal by itself. But it is not just the 2" diameter rubber part in the center; it's the entire 6" aluminum disk which the rubber seal is an intergal part of the disk.
I got a feeling they did not transfer over the seal from the old carrier, nor did they place a brand new seal in the new carrier.
Le Mans Master
Joined: Jul 2000
Posts: 7,758
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From: Fort Worth Texas
Cruise-In II Veteran
Cruise-In III Veteran
Re: Differential Compatability (Vettepartz)
The 2.73 carrier is a completly different animal than the 3.15 and 3.42 units.
Here is some more info:
In the seriel Number:
1st part of serial number
a = 2.73
b = 3.42
c = 3.15
g = 3.42 (Z06 shot peened gears)
2nd place in seriel number:
month built
3rd place = year built
Also,
On top of a 2.73 casing there will be the letter 'A' about 1 inch tall
On top of the other casings there will be a letter 'B' about 1 inch tall
Here is some more info:
In the seriel Number:
1st part of serial number
a = 2.73
b = 3.42
c = 3.15
g = 3.42 (Z06 shot peened gears)
2nd place in seriel number:
month built
3rd place = year built
Also,
On top of a 2.73 casing there will be the letter 'A' about 1 inch tall
On top of the other casings there will be a letter 'B' about 1 inch tall
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 179
From: S.W. Ohio. . . . . . NRA Life Member
Re: Differential Compatability (kewlbrz)
He said my old one had a seal but the new one doesn't have a place for it
It will be quite alot of mechanical labor to take it all apart just to put back the seal your mechanic forgot to install.
read it here:
Use the seal plate from the old differential or you’ll have a BIG leak. Note that the plate can go only one way. ......
from Norris Motorsports. Here is the entire text:
www.corvettefever.com/editorial/article.jsp?id=18978
Better call your mechanic ASAP. Has he ever done this before? If so, then all the others he has done are leaking as well.
[Modified by Mike Mercury, 3:18 PM 2/8/2002]
Team Owner
Joined: Apr 2001
Posts: 54,204
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From: S.W. Ohio. . . . . . NRA Life Member
Re: Differential Compatability (Mike Mercury)
here is a link to the blow-up of the carrier. They are (shown as three pieces) # 9, #10, and #11
Mike....sorry, this contains a link to a password protected site :cheers:
new carriers do not come with either of these items. Without the aluminum disk (#10), one would think there is no place for the seal.
[Modified by Mean Green 2000, 4:43 PM 2/8/2002]
Mike....sorry, this contains a link to a password protected site :cheers:
new carriers do not come with either of these items. Without the aluminum disk (#10), one would think there is no place for the seal.
[Modified by Mean Green 2000, 4:43 PM 2/8/2002]
Former Vendor
Joined: Apr 2001
Posts: 10,976
Likes: 21
From: FL
St. Jude Donor '13
Here is one possibility...Since your car came with the 2.73,I assume that you have an A4...The A4 differential pictured in Mike Mercury's post is from an A4 because it has the plate shown in the photo...A differential from an M6 does not have this plate...Was the 3.15 that was installed from an M6???? If so,the plate would have to be transfered from your 2.73 to the 3.15...This would explain why he stated "there is no place for a seal",because the seal goes in the plate.Without the plate,you have no seal :nonod:
In short,the M6 seal between the diff and TRANS is a big o ring on the TRANS,along with a seal on the TRANS for the output shaft,with another seal behind that to seal off the trans...The A4 simply has a seal on the diff as shown in the picture...For those of you that have an M6,if fluid is leaking out the back of the trans,guess where it is going??? You guessed it,into the rear diff ;)
In short,the M6 seal between the diff and TRANS is a big o ring on the TRANS,along with a seal on the TRANS for the output shaft,with another seal behind that to seal off the trans...The A4 simply has a seal on the diff as shown in the picture...For those of you that have an M6,if fluid is leaking out the back of the trans,guess where it is going??? You guessed it,into the rear diff ;)
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 179
From: S.W. Ohio. . . . . . NRA Life Member
Re: (C-5 TECH)
C-5 TECH;
good point (as always) :) You are absolutely correct that the MN6 does not have the seal plate.
I assumed the post originator had an A4 because he mentioned the car had a 2.73 originally.
I'd guess that if the mechanic said "the new one doesn't have a place for it" that he had never done this before; nor checked the service manual for the procedure on a A4.
We don't need no stinkin manuals. :nono:
[Modified by Mike Mercury, 11:51 PM 2/8/2002]
good point (as always) :) You are absolutely correct that the MN6 does not have the seal plate.
I assumed the post originator had an A4 because he mentioned the car had a 2.73 originally.
I'd guess that if the mechanic said "the new one doesn't have a place for it" that he had never done this before; nor checked the service manual for the procedure on a A4.
We don't need no stinkin manuals. :nono:
[Modified by Mike Mercury, 11:51 PM 2/8/2002]
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Thread Starter
Pro
Joined: Nov 2001
Posts: 697
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From: Albuquerque NM
Re: Differential Compatability (Vettepartz)
Hey thanks guys. I posted this originally. Yes, it is an A4. The mechanic pulled everything out again and SAID he replaced seals with new ones. Put it back together and no leaks! I think more happened than he is telling me. Anyway, I am on the road again with a 3:15 and no leaks. Thanks for all the good info.
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 179
From: S.W. Ohio. . . . . . NRA Life Member
Re: Differential Compatability (Vettepartz)
I think more happened than he is telling me.
I think you are correct.. Glad it has finally been done right!
[Modified by Mike Mercury, 9:57 AM 2/9/2002]
I think you are correct.. Glad it has finally been done right!
[Modified by Mike Mercury, 9:57 AM 2/9/2002]