Z51 leaking 1/2 shaft
03-01-2014, 09:09 AM
#61
here is a picture
http://gilmore.chem.northwestern.edu/dsc_0540.jpg
lots of additional problems.
the transverse spring is made out of fiberglass and glue.
the differential oil will eventually dissolve the glue.
the differential oil is flammable at high temperatures, and when the
seals leak, it gets all over the half shafts which will happily spin the
oil all over the backs of the mufflers...
The problem is when the car sits outside at temperatures under 20F.
which in Chicago is something like 30 times this winter.
how they did the massive amount of engineering on this car and completely
blew it on a $20 part is beyond comprehension.
http://gilmore.chem.northwestern.edu/dsc_0540.jpg
lots of additional problems.
the transverse spring is made out of fiberglass and glue.
the differential oil will eventually dissolve the glue.
the differential oil is flammable at high temperatures, and when the
seals leak, it gets all over the half shafts which will happily spin the
oil all over the backs of the mufflers...
The problem is when the car sits outside at temperatures under 20F.
which in Chicago is something like 30 times this winter.
how they did the massive amount of engineering on this car and completely
blew it on a $20 part is beyond comprehension.
03-01-2014, 03:23 PM
#62
My C7 is vin 12208 and I took delivery January 20th.
03-01-2014, 03:35 PM
#64
Le Mans Master
OP - sounds like you got a defect during manufacturing ... probably not a design flaw. If it is a result of a design flaw then more leaky diffs will be popping up soon on C7s.
03-01-2014, 03:46 PM
#65
Le Mans Master
replaced the differential, and 2 days and 80 miles later and its leaking
on the left side again. Unless the half shaft is seriously out of balance causing
the problem, which I think I would have noticed, I really think the seals
are a major issue. I saw the differential before it was installed, clearly it
was a brand new part.
on the left side again. Unless the half shaft is seriously out of balance causing
the problem, which I think I would have noticed, I really think the seals
are a major issue. I saw the differential before it was installed, clearly it
was a brand new part.
03-01-2014, 03:47 PM
#66
Le Mans Master
Well it took a lot of arm twisting, but GM has finally acknowledged that
the seals do in fact contract at temperatures below 20F and then leak.
So a new seal design which probably means a new rubber formulation is
in the works. ETA unknown at this time. There is another non-chevy vehicle
effected by this seal issue.
the seals do in fact contract at temperatures below 20F and then leak.
So a new seal design which probably means a new rubber formulation is
in the works. ETA unknown at this time. There is another non-chevy vehicle
effected by this seal issue.
03-07-2014, 09:46 AM
#67
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Well it took a lot of arm twisting, but GM has finally acknowledged that
the seals do in fact contract at temperatures below 20F and then leak.
So a new seal design which probably means a new rubber formulation is
in the works. ETA unknown at this time. There is another non-chevy vehicle
effected by this seal issue.
the seals do in fact contract at temperatures below 20F and then leak.
So a new seal design which probably means a new rubber formulation is
in the works. ETA unknown at this time. There is another non-chevy vehicle
effected by this seal issue.
03-07-2014, 09:55 AM
#68
I have enough tickets to do the lemon law. I don't want my money back or I would
have done that already. I want the car fixed. You can be sure that GM will have a fix
for this before the 2015 MY. My guess is that greg and I have the same dealer.
Stopping by today for the every 500 mile differential fillup.
have done that already. I want the car fixed. You can be sure that GM will have a fix
for this before the 2015 MY. My guess is that greg and I have the same dealer.
Stopping by today for the every 500 mile differential fillup.
03-07-2014, 10:03 AM
#69
Melting Slicks
welcome to the club, my old vin 2181. i had so many problems with car i should have made GM buy car back, period. i have noticed that my new car is currently running good. even the dash does not get stuck like my old one.
my vin 2181 was in shop for 28 days total while i owed it. the rear axle 4 times, the front bumper keep coming loose, the audio controls would quit working. my dry sum oil system lines keep coming off had to be ordered and replaced. the rear axle problem started 3 days after buying.
my vin 2181 was in shop for 28 days total while i owed it. the rear axle 4 times, the front bumper keep coming loose, the audio controls would quit working. my dry sum oil system lines keep coming off had to be ordered and replaced. the rear axle problem started 3 days after buying.
03-07-2014, 10:05 AM
#70
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I bought my car at Grossinger and have the ticket for the rear end open at ROCK Chevy. I saw the oil on the floor of my garage and had seen the thread here. So i had them look when i was getting a alignment, sure enough same spot. What dealer do you have the ticket open at? I keep the car in a heated garage most of the time so it is only a issue if i leave it out side at work on a very cold day.
03-07-2014, 10:07 AM
#71
welcome to the club, my old vin 2181. i had so many problems with car i should have made GM buy car back, period. i have noticed that my new car is currently running good. even the dash does not get stuck like my old one.
my vin 2181 was in shop for 28 days total while i owed it. the rear axle 4 times, the front bumper keep coming loose, the audio controls would quit working. my dry sum oil system lines keep coming off had to be ordered and replaced. the rear axle problem started 3 days after buying.
my vin 2181 was in shop for 28 days total while i owed it. the rear axle 4 times, the front bumper keep coming loose, the audio controls would quit working. my dry sum oil system lines keep coming off had to be ordered and replaced. the rear axle problem started 3 days after buying.
03-07-2014, 10:23 AM
#72
my dealer is stasek chevy in wheeling. continuous open ticket for topping off
the fluid. They actually drain it every time to measure the loss and return the
information to GM. and correlate with the temperature. Matches up pretty well.
The car is outside at work all day every work day.
would be nice to find a better way of knowing when the differential was .25 quart
low (like via differential temperature) it would make things easier till the new
seals show up.
the fluid. They actually drain it every time to measure the loss and return the
information to GM. and correlate with the temperature. Matches up pretty well.
The car is outside at work all day every work day.
would be nice to find a better way of knowing when the differential was .25 quart
low (like via differential temperature) it would make things easier till the new
seals show up.
03-07-2014, 10:40 AM
#73
my dealer is stasek chevy in wheeling. continuous open ticket for topping off
the fluid. They actually drain it every time to measure the loss and return the
information to GM. and correlate with the temperature. Matches up pretty well.
The car is outside at work all day every work day.
would be nice to find a better way of knowing when the differential was .25 quart
low (like via differential temperature) it would make things easier till the new
seals show up.
the fluid. They actually drain it every time to measure the loss and return the
information to GM. and correlate with the temperature. Matches up pretty well.
The car is outside at work all day every work day.
would be nice to find a better way of knowing when the differential was .25 quart
low (like via differential temperature) it would make things easier till the new
seals show up.
03-07-2014, 10:45 AM
#74
Instructor
Member Since: Jun 2000
Location: Island Lake il
Posts: 201
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my dealer is stasek chevy in wheeling. continuous open ticket for topping off
the fluid. They actually drain it every time to measure the loss and return the
information to GM. and correlate with the temperature. Matches up pretty well.
The car is outside at work all day every work day.
would be nice to find a better way of knowing when the differential was .25 quart
low (like via differential temperature) it would make things easier till the new
seals show up.
the fluid. They actually drain it every time to measure the loss and return the
information to GM. and correlate with the temperature. Matches up pretty well.
The car is outside at work all day every work day.
would be nice to find a better way of knowing when the differential was .25 quart
low (like via differential temperature) it would make things easier till the new
seals show up.
03-07-2014, 11:02 AM
#75
good idea. service writer tom, master tech elvis.
local GM rep well aware of what is going on.
The more people bringing their cars in for the same
problem, the faster its going to get fixed.
local GM rep well aware of what is going on.
The more people bringing their cars in for the same
problem, the faster its going to get fixed.
03-07-2014, 12:28 PM
#76
Melting Slicks
My 2002 C5Z has never had a leaky differential. A lot of the "leaks" on C5 differentials were actually puking vents, not leaky seals or O-rings.
OP - sounds like you got a defect during manufacturing ... probably not a design flaw. If it is a result of a design flaw then more leaky diffs will be popping up soon on C7s.
OP - sounds like you got a defect during manufacturing ... probably not a design flaw. If it is a result of a design flaw then more leaky diffs will be popping up soon on C7s.
03-07-2014, 01:37 PM
#78
Melting Slicks
Wow I am sorry to hear that. Really is inexcusable for GM to repeat this issue. I know they spent over $2000 having to do mine two times. I think the only reason I no longer have the issue except for the venting of fluid is because I upgraded my Rear Differential to a DTE 4:10 dif. Since then no leaky seals.
03-07-2014, 11:06 PM
#79
Visited the dealer today and the leak is coming from the diff. GM has not released a service bulletin about it apparently. The dealer is going to replace the seal, but the temps are warming up here so the problem may go away until next winter. Hope GM has a fix by then.
03-07-2014, 11:46 PM
#80
Le Mans Master
