Author Topic: My Rear is VENTING?!?! - FIXED (Read 11332 times)

Brad Kenny · « **on:** March 25, 2011, 09:57:06 AM »

Yesterday, while I had Lindsey up on a lift doing work, I noticed fluid coming from the rear differential on the driver's side drive axle nearest the differential.

No drops of oil on the pavement, but the rear diff is coated in oil/dirt.

Should I be worried? OR is this normal?

I have 42,378 miles and know I am still good for power train warranty.

Critterman · « **Reply #1 on:** March 25, 2011, 09:58:36 AM »

I think you should go see your corpsman with a leaky rear, or at least go to the exchange for some depends.

Critterman · « **Reply #2 on:** March 25, 2011, 10:00:33 AM »

Now a serious reply, Driver's side is usually the vent, has your car had the vent replaced? Do you have the hose extension on the vent? If not those are all fixes for what you are seeing and there are TSB's out

Brad Kenny · « **Reply #3 on:** March 25, 2011, 10:05:37 AM »

Two previous dealerships say I have the TSB done on my car by GM records. Should I try to get them to "top off" my rear diff?

I have no clunk/thunk, only a light tire squeal when I turn the steering wheel all the way over (normal). Basically, I have no problems with the exception of the oil.

DeepBlueGXP · « **Reply #4 on:** March 25, 2011, 10:09:54 AM »

Clean it up and see if the issue comes back. You can always change the fluid yourself to ensure you have the right capacity inside.

To test for sounds, you need a good size parking lot, put the car in reverse with the wheel turned all the way one direction and backup slow. The change to the other direction and backup. If you hear grinding noise or suspect anything, take it in.

Brad Kenny · « **Reply #5 on:** March 25, 2011, 10:14:31 AM »

Figured it is covered under warranty so, might as well give the dealership a cut on it. I drive waaaayyy too many miles a month to not have it looked at before my next big haul down to VA.

Thanks for the "how to" test of the rear diff. Could not find it with a search under problems and service, otherwise I would not have asked. I thought we had a sticky for rear diff issues somewhere but cannot find it for the life of me and my computer at work is blocking the search engine for KP.

smartin · « **Reply #6 on:** March 25, 2011, 10:17:12 AM »

One thing you can try Jeremy is to put cardboard under it at night to really see if anything is dripping. Once I had the tube bypass done, I never had anymore issues. But from time to time, someone would say there might be something wrong. I would just have them clean it off and keep an eye on it. Nothing since.

Good luck! But you're right with all the miles you travel, you don't want anything going wrong.

Brad Kenny · « **Reply #7 on:** March 25, 2011, 01:33:11 PM »

Did the recommended "testing" during lunch, found no grinding.

Took car by the dealership, they say it is NOT covered by warranty?!? Need to do some more research on this tidbit before Monday when she goes in for a "look". They also said they "might" stretch the warranty to cover the "possible" rear diff failure or replenishment of fluid.

Any input on this?

tazz · « **Reply #8 on:** March 25, 2011, 08:27:03 PM »

TSB's are only covered while in the BTB warranty or extended warranty unless they are MANDATORY SAFETY RECALLS. My guess is that they will do a 50% 50% split on any warranty work repairs.
Mine still seemed to expell a slight amount from the tube after it was installed but none on the ground. Unless your having issues I wouldn't worry.

tazz · « **Reply #9 on:** March 25, 2011, 08:37:53 PM »

Have them double check the warranty since it's an 07. I thought that the 07's had a supplemental warranty for the Engine, Transmission and drive systems of 5yrs or 100K with zero deductable.

Aspenrose · « **Reply #10 on:** March 26, 2011, 12:03:10 PM »

Quote from: CT_Solstice on March 25, 2011, 09:57:06 AM

Yesterday, while I had Lindsey up on a lift doing work, I noticed fluid coming from the rear differential on the driver's side drive axle nearest the differential.

No drops of oil on the pavement, but the rear diff is coated in oil/dirt.

Should I be worried? OR is this normal?

I have 42,378 miles and know I am still good for power train warranty.

could well be the axle seal, I had to have mine done twice, once very early on, then again the driver side was leaking at that point and was done again with the recall for the diff itself.

Go-N Def · « **Reply #11 on:** March 26, 2011, 01:42:39 PM »

Quote from: Critterman on March 25, 2011, 09:58:36 AM

I think you should go see your corpsman with a leaky rear, or at least go to the exchange for some depends.

He's a sub guy. It goes with the territory!

snaponbob · « **Reply #12 on:** March 26, 2011, 02:07:34 PM »

Quote from: CT_Solstice on March 25, 2011, 01:33:11 PM

Did the recommended "testing" during lunch, found no grinding.

Took car by the dealership, they say it is NOT covered by warranty?!? Need to do some more research on this tidbit before Monday when she goes in for a "look". They also said they "might" stretch the warranty to cover the "possible" rear diff failure or replenishment of fluid.

Any input on this?

Warranty on an 07 is 3/36 on the entire car (so THAT has expired) and 5/100 on the "power train". So you will need to research the 5/100. This might help (found it via Google) --- http://www.gminsidenews.com/forums/f19/2007-gm-5-100-warranty-info-46211/

Here is the actual results of a search - http://www.google.com/search?q=GM+5%2F100+warranty&ie=utf-8&oe=utf-8&aq=t&client=firefox-a&rlz=1R1GGLL_enUS412US412

GASNGO · « **Reply #13 on:** March 26, 2011, 03:49:13 PM »

What exactly is the fix that has been mentioned for the leaky rear end housing breather tube?
Any pictures of this, I love pictures.

MomsSol · « **Reply #14 on:** March 26, 2011, 10:57:41 PM »

Quote from: CT_Solstice on March 25, 2011, 01:33:11 PM

Did the recommended "testing" during lunch, found no grinding.

Took car by the dealership, they say it is NOT covered by warranty?!? Need to do some more research on this tidbit before Monday when she goes in for a "look". They also said they "might" stretch the warranty to cover the "possible" rear diff failure or replenishment of fluid.

Any input on this?

They don't have to 'stretch' anything!

ALL 07 models have a 5yr 100k mile on the powertrain .. this INCLUDES the differential. If you have ANY problems with it .. ask them to call GM Tech and verify it.

As long as you're under the 100k this should not be an issue!

Brad Kenny · « **Reply #15 on:** March 26, 2011, 11:30:43 PM »

Thanks all for lower my concerns abpout having to fight for a new rear differential. Guess I should push to get it done right, especially if things work out for me in the near future. I am a true believer in you have to pay to play so I had already set aside enough money to replace the rear diff if needed. Guess I will have to apply that to something a little more fun!

MomsSol · « **Reply #16 on:** March 27, 2011, 08:22:28 AM »

Quote from: desk305 on March 26, 2011, 03:49:13 PM

What exactly is the fix that has been mentioned for the leaky rear end housing breather tube?
Any pictures of this, I love pictures.

You have a 08 and this was only an issue on the 06 and early 07 models. The vent tube was extended to keep the differential fluid from "burping" onto the housing - this problem was corrected on the later 07 version differential.

tazz · « **Reply #17 on:** March 27, 2011, 10:12:00 AM »

CT
The dealer full of BS or they actually do not know and that's possible.
Do you have all your owners manuals you got with the car?
It's either in the main owners manual or one listed as supplemental owners warranty and show them. Talk politely to the shop Mgr or even the dealership Mgr about it and if they still insist that it is not covered bust out the owners manual and show them the pages that state it's covered and see what they have to say or you can also just go someplace else that is a little more knowledgeable about warranty work. I have a scan of the pages on my PC but not on my Lappy so I cant post up right now.

Brad Kenny · « **Reply #18 on:** March 27, 2011, 11:52:32 AM »

Monday at 1130 I take Lindsey in for her official "look" for the rear diff issue. I think it is still okay, may just need some fluid replenishment or a new driver's seal.

Everyone here has been extremely helpful and I will pull all the books out and go through them to re-verify my warranty with the dealership. The service manager is fully aware of the TSB and knows of the powertrain warranty. He "wasn't sure if the rear diff seals would be covered" but would look into it once we got a better determination if there is damage or just extra fluid burping out of the vent.

Ultimately this dealership has not done me wrong yet. They have very knowledgeable techs who do great work. I am sure we will come through all the warraty issues ifwe need to.

Thanks all again! I will update tomorrow once I get the initial assesment tomorrow.

tazz · « **Reply #19 on:** March 27, 2011, 01:49:46 PM »

Hear is a scan of the page on what's covered.
The way I take it EVERYTHING that is a drive system component is covered seals included.

Brad Kenny · « **Reply #20 on:** March 28, 2011, 01:57:14 PM »

Well, back form the dealer and here is the official determination:

Rear differential driver's side drive axle seal: No issues, no leakage, and all clearances within tolerances.
Rear differential vent: leaking minute amounts of 75W90 fluid (believed due to high speed runs or hard cornering at high speed causing abnormal sling of fluid inside the differential). No admission on my part, just what they have seen in the past.

Corrective actions: replace fluid with 75W90 (6-7 oz) and replace vent with one prescribed by the TSB 07-04-20-001A, for Axle Fluid Seeping or Venting from Rear Differential. Cost to dealership $285 to conduct potential future repairs with 6-8 week lead time for Differential Vent Plug (metal vice plastic). OR fill the rear differential and give me the bottle of fluid for future filling as necessary (recommended checking level every 10000 miles).

I do not feel like losing Lindsey for a day just to replace a small vent part and a 14" piece of hosing that is tied off to the top of the gas tank. I told them to order the vent and hose clamps and when they got them in I would pick them up and perform the TSB myself, at my convenience.

This means I have a bottle of rear differential fluid (nearly full - 28 oz) that I will bring to the SMMM8. Anyone that would like to "top off" their Rear differential, I have been trained by the dealership, and would be more than happy to share with the crowd. As long as it doesn't impact the other mods ongoing and we can get time on the jackstands. I will bring those too, JIC.

Overall, a happy ending for me. I knew she was good to go, since I had no other indications of issues from the rear end.

SO basically, she was having some wet farts when ridden hard. Imagine that. LOL!

Brad Kenny · « **Reply #21 on:** March 28, 2011, 02:18:48 PM »

Quote from: Critterman on March 25, 2011, 09:58:36 AM

I think you should go see your corpsman with a leaky rear, or at least go to the exchange for some depends.

I did... He (Doc) just laughed and called in a Nurse Practicioner... She laughed too!

They wrote it up to abnomal VENTING...

Uranium-238 · « **Reply #22 on:** March 28, 2011, 03:51:40 PM »

Glad to hear it's nothing major. Really cool that the dealership is giving you the parts to install yourself.

smartin · « **Reply #23 on:** March 28, 2011, 04:14:16 PM »

Good news!

MomsSol · « **Reply #24 on:** March 28, 2011, 07:03:47 PM »

I would STRONGLY recommend against doing the TSB yourself ... the why: you're leaving the door wide open for nullification of any warranty issue in the future. Should something more serious occur later they 'could' blame any new issue on the installation of the new vent tube not being done by a 'qualified' GM Tech and thus you lose any chance of having a differential replaced should it ever come to that ...................... just sayin'

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Author Topic: My Rear is VENTING?!?! - FIXED (Read 11332 times)