Which Axle Shaft???
Thread Starter
Le Mans Master
Joined: Jun 2011
Posts: 8,049
Likes: 330
From: Charlotte NC
St. Jude Donor '14-'15
Which Axle Shaft???
There is so much different information out here on the web and i do not want to buy the incorrect parts so.........
I have a 2008 Z51 A6 with just over 200,000 miles and I did a cam and things recently so I'm wanting to do some more preventative maintenance.
I'm wanting to replace the rear Axle shafts and there very different opinions out there and it's a bit confusing even at the GM web sites. Some say that I can use C5 Z06 axle shafts. Most sources say 2005 thru 2013 are all the same. I don't think this is True?
Thru GM I get these part numbers...
22873444 they say these will fit a Base, Z51 and a Z06. These are around $200 each.
25941372 they say these will fit a Base, Z51 and a Z06. These are around $340 each.
Does anybody know for sure?
I have a 2008 Z51 A6 with just over 200,000 miles and I did a cam and things recently so I'm wanting to do some more preventative maintenance.
I'm wanting to replace the rear Axle shafts and there very different opinions out there and it's a bit confusing even at the GM web sites. Some say that I can use C5 Z06 axle shafts. Most sources say 2005 thru 2013 are all the same. I don't think this is True?
Thru GM I get these part numbers...
22873444 they say these will fit a Base, Z51 and a Z06. These are around $200 each.
25941372 they say these will fit a Base, Z51 and a Z06. These are around $340 each.
Does anybody know for sure?
Melting Slicks
Joined: May 2020
Posts: 2,135
Likes: 1,309
From: North Little Rock, AR
I have found that rockauto is a good source for part numbers. Looks like the 4444 number is correct.
https://www.rockauto.com/en/catalog/...n,cv+axle,2288
https://www.rockauto.com/en/catalog/...n,cv+axle,2288
Thread Starter
Le Mans Master
Joined: Jun 2011
Posts: 8,049
Likes: 330
From: Charlotte NC
St. Jude Donor '14-'15
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
So when you have these types of questions, a quick source of part number info is any GM dealer's back door website. I generally use www.gmpartsoutlet.net since they are local to me, but most dealers have an online parts back door.
Thread Starter
Le Mans Master
Joined: Jun 2011
Posts: 8,049
Likes: 330
From: Charlotte NC
St. Jude Donor '14-'15
So when you have these types of questions, a quick source of part number info is any GM dealer's back door website. I generally use www.gmpartsoutlet.net since they are local to me, but most dealers have an online parts back door.
I have a similar link to another dealer that is where I got the part numbers I listed in my opening post.I guess my real question should be... what is the better of the 3 I have listed GM parts would be the best If I am going to buy brand new axle shafts from GM. and does the C5 axle shaft actually fit and is it better.
Some sites say all 05 - 13 are the same. some say that in 2009 they made a spline change and they will not fit the 05-08. Too many different facts out there.
Burning Brakes
Joined: Jul 2002
Posts: 1,136
Likes: 100
From: Nova Scotia
AFAIK the 2009 spline change only applies to the Z06. Basically it switched to the same as the then new ZR1. My 2009 base is 30 spline like the earlier cars and C5s.
To answer the what's better question, I was told by rpm transmission that if I wanted stronger axles to get the C5 axles. I also know that they made a few changes through the years to the C6 Z06 axles before switching to 33 spline. The newest version seems to be pretty good, which I believe is the 372 you referenced. I don't know what's better between the 372 and 444 though, although I would have to think the Z06 axles would be stronger.
I did a lot of searching for axle info a few years ago when I did gears. Hard to find much info on base axles. Lots of info on the known to break early C6 Z06 axles
To answer the what's better question, I was told by rpm transmission that if I wanted stronger axles to get the C5 axles. I also know that they made a few changes through the years to the C6 Z06 axles before switching to 33 spline. The newest version seems to be pretty good, which I believe is the 372 you referenced. I don't know what's better between the 372 and 444 though, although I would have to think the Z06 axles would be stronger.
I did a lot of searching for axle info a few years ago when I did gears. Hard to find much info on base axles. Lots of info on the known to break early C6 Z06 axles
Last edited by hubes; Mar 3, 2022 at 06:17 PM.
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Thread Starter
Le Mans Master
Joined: Jun 2011
Posts: 8,049
Likes: 330
From: Charlotte NC
St. Jude Donor '14-'15
I've replaced the nuts twice on one side and once on the other and torqued them to 160 ft. lbs. I've been reading here and other places about that torque being too much and breaking the axle at the bearing. Car is my DD and just broke 200,000 miles and to be on the safe side I'd like to replace them and the bearings also. I was looking at Timkin for wheel hubs front and rear.